Green’s Dictionary of Slang

swell v.

[swell n.1 (1)]

1. to act in an aristocratic, ostentatious manner (towards).

[UK] ‘Shadrack, The Orangeman’ Universal Songster I 27: How dat fellow vat calls himself a Jew, and swells about coming from Duke’s Place, tinks vat he has done de Frenchman, tip’d him de smitch and all that.
[UK] ‘The Lecherous Irishman’ Luscious Songster 35: In Cork he had swell’d all the girls I declare.
[UK]Comic Almanack May 316: Then he turns out a dandy complete, to swell up and down Regent Street.
[US]Life in Boston & N.Y. (Boston, MA) 7 Sept. n.p.: [He] swells around with the ballet girls and is ‘bully’ in all the brothels and drinking shops.
[US]‘Mark Twain’ Roughing It 222: What did you come swellin’ around that way for, and tryin’ to raise trouble?
[US]‘Mark Twain’ Life on the Mississippi (1914) 44: He would come home and swell around the town.
[US]‘Mark Twain’ Tom Sawyer, Detective 115: He’s been swelling around here with them a month; yes, sir, twelve thousand dollars’ worth of di’monds on him.
[Aus]Bulletin (Sydney) 15 Dec. 39/3: Now Tim, by raison av his rapidly accumulatin’ bank-account, put on more dog than many an inspecthor. He swelled round in a silk vest an’ tie av a chaste vermilion and yellow hue [...].
[US]Hecht & MacArthur Front Page Act I: A lot of lousy, daffy, buttinskis, swelling around with holes in their pants, borrowing nickels from office boys.

2. (US) to promote, to praise.

[US]F. Hutcheson Barkeep Stories 166: ‘I been huntin’ on de level, but I ain’t stuck on de game. Dem guys dat’s been swellin’ it up to me round here kin have it’.

3. to exaggerate.

[US]W.J. Kountz Billy Baxter’s Letters 38: Jim, I’m not swelling this a bit. On the level, it happened just as I write it.

SE in slang uses

In compounds

swellhead (n.)

see separate entries.

swell-headed (adj.)

see separate entry.

swell-nose (n.) [its effects]

strong beer.

(ref. to 1515) J.E. Hodgkin in N&Q Ser. 3 VII 25 Feb. 163: In the treatise De Generibus Ebriosorum et Ebrietate Vitanda, written a.d. 1515, occurs a chapter on the various kinds of beer then in use in Germany. [...] I select a few of the most presentable: Cow’s-tail, Calve’s-neck, Buffalo, Slip-slop, Stamp-in-the-Ashes, Knock-’em-down [...] Swell-nose.