Green’s Dictionary of Slang

lush v.

[lush n.1 (1)]

1. [19C–1900s] to ply with drink, to make drunk.

2. [early 19C+] to drink.

In compounds

lushing ken (n.)

[mid-19C] a public house, a tavern.

In phrases

lush (it) up (v.)

1. [late 19C+] (also lush around) to drink, usu. alcohol; to become drunk.

2. [1920s+] to ply with drink.