Green’s Dictionary of Slang

iron adj.

courageous, fearless.

[US]Matsell Vocabulum 44: iron Courage; fearless; staunch.

SE in slang uses

In compounds

iron ball (n.)

(US Und.) a purge of ‘red light’ areas.

[US]N.Y. Times 12 Feb. 2: The ‘iron ball,’ which in police parlance means a shake-up, rolled yesterday in the Tenderloin.
iron bar (v.) (also bar)

(Aus. prison) to make a surprise attack (irrespective of the weapon used).

[Aus]Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Iron-bar. Literally to hit someone with an iron bar but generally referring to any surreptitious attack. [Ibid.] Bar. 1. A contraction of iron bar.
iron butterfly (n.) (also butterfly) [shape; the curved finger-holes are the ‘wings’ of the butterfly]

an old-fashioned hypodermic syringe made of metal and glass.

[US]S. Morgan Homeboy 102: The medic withdrew an antique syringe with a curlicued metal plunger [...] ‘An oldtime iron butterfly’, Joe breathed reverentially [...] From far away he heard the painful grunt as the butterfly struck.
[US]N. Walker Cherry 77: Eventually we did stick one another’s real-life veins with 14ga needle-catheters, and we drew one another’s real-life blood with butterflies.
iron cunny (n.) [pron. SE candy]

(W.I.) a tough sugar candy, extremely hard to chew.

[WI]cited in Cassidy & LePage Dict. Jam. Eng. (1980).
iron cure (n.) (also steel and concrete cure) [the iron bars of the cell]

(US drugs) a ‘cure’ for addiction given in prison: the prisoner is deprived of drugs and forced to withdraw in his cell.

[US]D. Maurer ‘Lang. of the Und. Narcotic Addict’ Pt 2 in Lang. Und. (1981) 104/1: iron-cure. The cold-turkey treatment usually administered in jails and prisons; the addict is taken off drugs suddenly and allowed to kick his habit out on the floor of his cell. [Ibid.] 109/2: steel-and-concrete cure. See iron-cure.
[US]Anslinger & Tompkins Traffic In Narcotics 311: iron cure. A cure for addiction which the addict undertakes voluntarily.
[US]J.E. Schmidt Narcotics Lingo and Lore 174: Steel cure [...] Steel-and-concrete cure – A method of treating severe narcotic addiction by the sudden imposition of an inflexible regimen of total abstinence.
iron doublet (n.) [Carew (1785–1882), Kent (1835), ‘Sinks’ (1848) and F. Dunscombe (c.1850) all offer erroneously iron-doublet, a parson]

1. a prison.

[UK]B.E. Dict. Canting Crew n.p.: Iron-doublet a Prison.
[UK]New Canting Dict. [as cit. c.1698].
[UK]Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
[UK]Grose Classical Dict. of the Vulgar Tongue.
[UK]Lex. Balatronicum.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.

2. (US) innocence.

[US]Trumble Sl. Dict. (1890) 18: Iron doublet. Innocence; not guilty.
iron eye (n.)

(US) a hard and hostile stare.

J. Thurber in H.T. Paxton Sport USA (1961) 297: We stand there givin’ ’em the iron eye, it bein’ the lowest ebb a ball-club manager’d got hisself down to since the national pastime was started.
iron feed (n.) [such a starchy dish is very ‘hard’]

(W.I.) corn meal cooked with rice.

[WI]cited in Cassidy & LePage Dict. Jam. Eng. (1980).
iron garters (n.) (also iron boots, iron gaiters)

leg-irons, fetters.

[UK]Hell Upon Earth 2: He’s adorn’d with a pair of Iron Boots.
[UK]C. Johnson Hist. of Highwaymen &c. 74: We were presently under Lock and Key, and were attended by a very complaisant Person, who made each of us a Present of a Pair of Iron Garters.
W. Falconer Dict. Marine (1780) n.p.: Iron Garters, a cant word for bilboes, or fetters.
[Scot]Scott Rob Roy (1839) 57: Muckle wad the provost and bailies o’ Glasgow gie to hae him sitting with iron garters to his hose within their tolbooth, that now stands wi’ his legs as free as the red-deer’s.
[US]H.A. Wise Tales for the Marines 312: You have a chance for a pair of twenty pound iron gaiters on your shanks at Rio, for your share of the copper venture.
[UK]W.H. Smyth Sailor’s Word-Bk (1991) 404: Iron Garters. A cant word for bilboes, or fetter.
iron hat (n.) [note WWI US milit. iron derby, a steel helmet]

(US) a derby hat.

[US]Princeton Union (MN) 18 Mar. 5/3: ‘Iron Hats’ in black, brown and pearl, latest styles.
[US]Arizona Republican (Phoenix) 22 July 7: Toggery’s Shovel ’Em Out Sale [...] Iron Hats sale price $2.10.
[US]T.A. Dorgan Indoor Sports 12 Sept. [synd. cartoon] Indoor Sports — Coming to work with last winter’s iron hat. Where did you get that boiler?
[US]Eve. Public Ledger (Phila., PA) 3 Oct. 27: [cartoon caption] Petey — Sure, Hard Head — Iron Hat I guess I’ll get me a new roof.
[US]Judge (NY) 91 July-Dec. 31: Iron Hat - Derby.
[US]A.J. Pollock Und. Speaks.
ironhead/-headed

see separate entries.

iron horse (n.)

see separate entries.

iron house (n.)

1. (US Und., also iron hotel) a prison.

[US]Anaconda Standard (MT) 10 June 4/4: The Indians [...] decided to capture him and turn him over to the ‘white man’s chief at the iron house’.
[US]T.A. Dorgan in Zwilling TAD Lex. (1993) 99: If I make a break I’m liable to be put in the old iron house for a stretch.
[US]E. O’Neill Hairy Ape VI: This is the old iron house.
[US]Irwin Amer. Tramp and Und. Sl. 107: Iron House. – A gaol or prison.
[US]A.J. Pollock Und. Speaks n.p.: Iron hotel, a jail.
[US]D. Maurer ‘Argot of the Und. Narcotic Addict’ Pt 1 in AS XI:2 123/1: iron house. A city jail.
[US]Monteleone Criminal Sl. (rev. edn).
[US]Goldin et al. DAUL 108/2: Iron-house, n. (Pennsylvania and near South) 1. A local jail. 2. (Rare) The segregation jail within a prison.
[US]Bentley & Corbett Prison Sl. 4: Iron House A prison.

2. a punishment cell.

see sense 1.
iron lung (n.)

1. a deep air-raid shelter in the London underground.

[UK]Partridge DSUE (8th edn) 601/1: 1940–5.

2. the Central Line, in its extension from Shoreditch to Essex.

[UK]Partridge DSUE (8th edn) 601/2: 1950+.

3. (Irish) an aluminium keg of beer, usu. Guinness.

[Ire]Share Slanguage.

4. an open-air urinal.

[UK]D. Powis Signs of Crime 189: Iron lung Old-fashioned street urinal with iron fixtures.
iron Mike (n.)

see separate entry.

iron mittens (n.)

handcuffs.

Devizes & Wiltshire Gaz. 25 Dec. 4/1: Then they put the iron mittens on me [...] They took me before Ould Justice Ballymagtoglem.
iron mouth (n.)

(US teen) one who wears orthodontic braces.

Delaware Co. Dly Times (Chester, PA) 5 Feb. 9/1: I had to live with the names ‘tinsel teeth’ and ‘iron mouth’ [...] it hurts.
iron pile (n.) (also weight pile) [SE/iron n. (3i)] (US Und.)

the weight-lifting and body-building facilities in a prison .

[US]G. Liddy Will (con. 1973) 325: I started working out with the other clerk, a good friend who hated weight-lifting as much as I loved it. He paid a black man who had operated a health club in civilian life to drag him out of bed to the ‘iron pile’.
[US]Bentley & Corbett Prison Sl. 4: Iron Pile also Weight Pile The area of the recreation yard of a prison where weightlifting equipment is kept and used.
D. Grann ‘The Brand’ in New Yorker 16 Feb. 170/3: ‘I’ll outfit it with a well-stocked law library, computer research desk, copy machine, iron pile, pool table’.
iron theatre (n.)

(US Und.) a prison.

[US]G. Rector Girl from Rector’s 68: In passing their tables I often heard such sinister words as ‘the mouthpiece,’ ‘the big store,’ ‘the mob,’ ‘the iron theatre,’ and ‘the rap.’.
[US]A.J. Pollock Und. Speaks n.p.: Iron theatre, a building that houses police headquarters, district attorney’s office, police and criminal courts and city prison.
Iron Triangle (n.)

(US, NY) the former industrial neighborhood of Willets Point, Queens.

B. Nadler ‘Walk Up’ in ThugLit Mar. [ebook] [T]hey were jacking cars every night, and selling them up in the Iron Triangle in Queens.