Green’s Dictionary of Slang

muscle v.

1. (orig. US, also muscle up) to put pressure on, to coerce with threats of violence, poss. to beat up; cit. 1802–19 is properly a pun on SE mussels.

[UK] ‘Betty Brill’ in Holloway & Black I (1975) 310: A secret soon came out, / A rival he came in, / Who muscles cried about / And muscled me – don’t grin.
[US]Chicago Trib. 18 Jan. 21/4: A certain gentleman in the illicit spirits business was accosted by two sinister characters, who ‘muscled’ him, [...] removing from his wallet the sum of $150 [DA].
[US](con. 1920s) J.T. Farrell Judgement Day in Studs Lonigan (1936) 518: We can’t muscle the King out.
[US]R. Chandler Little Sister 149: Hicks [...] muscled the other guy out.
[US]W.R. Burnett Little Men, Big World 17: Harry had muscled it in some way — a great little muscle artist, not above blackmail.
[US]M. Spillane Return of the Hood 41: He took his first fall, did his time in Sing Sing, then came back and muscled Treetop right out of the business.
[US]Cab Calloway Of Minnie the Moocher and Me 4: The mob muscled Moe out.
[US]C. Stroud Close Pursuit (1988) 148: Give me the Ruiz case, I can muscle it through without having to go official.
[US](con. early 1950s) J. Ellroy L.A. Confidential 158: He could muscle the money out of her. [Ibid.] 430: Hotel good guy/bad guy rankled – they should be muscling Dudley at the Victory.
[US](con. 1964–8) J. Ellroy Cold Six Thousand 191: He muscled Webb Spurgeon. He explained stat-rape statutes. He detailed consent laws. Spurgeon gulped. Spurgeon kowtowed.
[US]W.D. Myers Autobiog. of My Dead Brother 46: ‘I heard Mason wanted to muscle up the guy in the bodega’.
[US] M. McBride Frank Sinatra in a Blender [ebook] It sounds like it could be the two that muscled you.

2. (US) to move something by force, to use one’s strength to achieve something.

[US]J. London in Century Mag. (N.Y.) Nov. 125: With the revolver still in the right hand, he muscled his body down into the hole .
[US]H. Kephart Our Southern Highlanders 282: ‘I ain't goin' to bed it no longer" (lie abed). ‘We can muscle this log up’ .
[US]Ersine Und. and Prison Sl.
[US]N. Algren Man with the Golden Arm 176: You two guys muscle me back in some corner.
[US]Randolph & Wilson Down in the Holler 266: You-uns can muscle that little rock easy.
[Can]R. Caron Go-Boy! 291: Three young toughs [...] obviously intent on muscling me off the sidewalk.
[Aus]L. Davies Candy 25: If we muscle it, we can carry all the gear between the two of us.
[US]G. Pelecanos Right As Rain 244: Strange politely muscled his way into a position at the end of the stick.
[US]T. Robinson ‘Legendary [...] Ralphie O’Malley’ in Dirty Words [ebook] Ever tried to muscle a small tank through the snow?

3. (US) to bluff.

[US]H. Sebastian ‘Negro Sl. in Lincoln University’ in AS IX:4 288: muscle. Artificiality; bluff; wind.

4. (US drugs) to inject a drug into a muscle rather than a vein.

[US]T. Swerdlow Straight Dope [ebook] I come to [with] the needle still in my thigh. I was trying to play it safe, so I just ‘muscled’ it.

In phrases

muscle around (v.)

to search energetically.

[UK]P. Cheyney Dames Don’t Care (1960) 13: I come out to Palm Springs an’ started to muscle around for a job.
muscle in (v.) (orig. US)

1. to force an entrance, to use violence to gain something one desires.

[US]W.R. Burnett Little Caesar (1932) 122: Maybe he could muscle in on the North Side graft.
[US]C. Himes ‘Her Whole Existence’ in Coll. Stories (1990) 95: When the gangsters saw that he was making money, they had ‘muscled in’.
[US]N. Algren Never Come Morning (1988) 20: So long as them big guys don’t get the idea somebody’s tryin’ to muscle in ...
[US]B. Schulberg On the Waterfront (1964) 259: I know the guts it took to muscle in on this thing.
[US]P. Crump Burn, Killer, Burn! 347: Five ear-shattering reports [...] and I knew the ‘Independent’ had been muscled in on.
[UK]Wodehouse Much Obliged, Jeeves 66: Why people don’t object to somebody they don’t know from Adam muscling into their homes.
[US]E. Folb Runnin’ Down Some Lines 103: Muscling in on someone’s territory can provoke both angry words and sometimes blows.
[UK]D. Campbell That Was Business, This Is Personal 5: Some [drug dealers] muscled in to existing markets, others helped create their own.
[US]Hip-Hop Connection Dec. 4: Johnson (Fishburne) returns to...find that Dutch Schultz (Roth) is muscling in on his lucrative numbers racket.
M.E. Dassad ‘Chickenhawk’ at www.cultdeadcow.com 🌐 The pimps hassled me at first for muscling in on their turf, but since I started doing commission work for Nunzio’s crowd, they leave me the hell alone.
T.P. McCauley ‘Lady Madeline’s Dive’ in ThugLit Sept./Oct. [ebook] ‘Rothmann would never let you muscle in on one of Archie’s gambling dens’.
[Scot]G. Armstrong Young Team 9: The McIntyres think he’s tryin tae muscle in n they tan him a beaut.
[Aus]A. Nette Orphan Road 204: ‘He had enough on his plate with the cops and other crims trying to muscle in on the take from the robbery’.

2. to gain admission to, to get oneself involved.

[US]T.A. Dorgan in Zwilling TAD Lex. (1993) 58: Panning the mugg who ‘muscles in’ on the boss each day as he goes to chow.
[UK]P. Cheyney Dames Don’t Care (1960) 23: He muscles in on a big stock-pushin’ racket an’ he walks out of it with a quarter of a million dollars profit.
[US](con. 1948) G. Mandel Flee the Angry Strangers 323: The ‘squares’ were muscling in, making life serious.
[US]E. De Roo Young Wolves 71: Whatta you want, anyhow? [...] Muscle in?
[US]N. Pileggi Wiseguy (2001) 160: Henry started to muscle his way into a liquor-distribution route.
[UK]M. Herron Secret Hours 88: ‘Is that the real reason for all this? To keep De Vries from muscling in on your territory?’.
muscle up (v.)

(N.Z. prison) to arm oneself.

[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 121/1: muscle up v. to arm oneself .