Green’s Dictionary of Slang

tip n.¹

a draught of liquor; thus drink in general.

c.1698		B.E. Dict. Canting Crew n.p.: Don’t spoil his Tip, don’t baulk his Draught. A Tub of good Tip, (for Tipple) a Cask of strong Drink.
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
1738		Swift Polite Conversation 64: miss.: (With a Glass in her Hand.) Hold your Tongue, Mr. Neverout, don’t speak in my Tip.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1832		Spirit of the Times (NY) 31 Mar. 2/3: [A]fter another ‘tip at the canteen,’ [we] started for the woods.

In compounds

In phrases

have a tip on (v.)

to be drunk.

1984

Partridge DSUE (8th edn) 1237: [...] ca. 1905–20.