Green’s Dictionary of Slang

1. ten shillings, latterly 50p [i.e. half a £1].

1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
1984		Partridge DSUE (8th edn).

2. (orig. sporting) a half-pint (of beer).

1960		J. Franklyn Dict. of Rhy. Sl.
1998–2002		G.D. Smith Cockney Rhy. Sl. 🌐 Cow and Calf: Half (a pint).

3. a laugh.

1969		S.T. Kendall Up the Frog.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.