Green’s Dictionary of Slang

salve n.

1. (US) praise, flattery; any form of ‘line’ that facilitates a confidence trick; also v. and attrib.

Bolton Chron. 3 Oct. 7/1: Mr Alsop certainly did most ably try to salve and soft sawder the people.
[UK]Hotten Dict. of Modern Sl. etc.
[UK]Sl. Dict.
[UK]Leics. Chron. 6 Mar. 5/2: ‘Don’t salve me; don’t flatter me’.
[US]‘Hugh McHugh’ Down the Line 100: It’s immense for the chest measurements to have the bunch hand you out the salve spiel — believe me!
[US]K. McGaffey Sorrows of a Show Girl Ch. 16: Hand ’em salve, pardy, hand ’em salve. A soft answer turneth away wrath.
[US]Van Loan ‘Behind the Mask’ in Ten-Thousand-Dollar Arm 239: O’Higgins [was] the best umpire in the league — the salve passed without a nod.
[US]Day Book 9 Sept. 17/2: Well, Joe, you should have heard the salve those two Lukes were spreading.
[US]Monteleone Criminal Sl. (rev. edn).

2. (US tramp) butter.

[UK]Flash Mirror 20: A sponge and salve, two win.
[US]True Northerner (Paw Paw, MI) 19 Oct. 7/1: ‘Then salve is —’ ‘Butter, oleomargarine’.
implied in Pennsylvania salve under Pennsylvania adj.
[US]M.G. Hayden ‘A Word List From Montana’ in DN IV:iii 245: salve, n. Butter. ‘Pass the salve’.
[US]W.R. Morse ‘Stanford Expressions’ in AS II:6 278: salve—butter.
[US]Mencken Amer. Lang. (4th edn) 582: Milk is cow-juice, butter is salve or axle-grease.
[US]P. Kendall Dict. Service Sl. n.p.: butter [...] salve.

3. (US) money, esp. as a reward for something difficult.

[US]cited in Wentworth & Flexner DAS (1975) 441/1: That [$4,100] is nice salve, even after taxes.

4. (US campus) exaggeration.

[US]R. Bolwell ‘College Sl. Words And Phrases’ in DN IV:iii 234: salve, n. Exaggeration.

5. (US/US tramp) a bribe.

[US]R. Bolwell ‘College Sl. Words And Phrases’ in DN IV:iii 234: salve, n. [...] An enticing offer.
[US]AS I:4 251: Salve—a bribe given to a trainman for a ride.

6. (US tramp) a complaint.

[US]P. & T. Casey Gay-cat 304: Salve—a complaint.

In compounds

salve-eater (n.)

(US) an immigrant from northern Europe, esp. a Swede.

[US]‘Dean Stiff’ Milk and Honey Route 38: Swedes are ‘roundheads’ or ‘salve eaters’.

In phrases

spread (the) salve (v.) (also give someone the salve, shoot the salve)

(US) to talk in a conciliatory, soothing manner (to); thus salve-spreader, a smooth talker.

[US]H. Green Maison De Shine 221: I let the servant shoot a little salve about me bein’ one of the real guys an’ all that.
[US]Wkly Tribune & Cape Co. Herald (Cape Girardeau, MO) 27 Apr. 6/6: Take one of those salve spreaders and he’ll come right up to you and remove your suspenders while you look at him and grin.
[US]R. Lardner Big Town 71: So when he’d spread all the salve, he rung the bell and in come Allah with cocktails.
[US]Maines & Grant Wise-crack Dict. 14/1: Spread the salve – Soft, conciliatory talk.
[US]C. Samolar ‘Argot of the Vagabond’ in AS II:9 392: What kind o’ salve are ye tryin’ t’ spread on us?
[US]G. Milburn ‘Toledo Slim’ in Hobo’s Hornbook 194: We chewed the rag for quite a while, I shot the con for fair, / (And when it came to spreading salve, you may gamble I was there).
[UK]Wodehouse Much Obliged, Jeeves 60: Conciliatory, I think you’ll agree. I could hardly have given him the old salve with a more liberal hand.