Green’s Dictionary of Slang

lower v.

SE in slang uses

In phrases

lower (a glass) (v.)

[late 19C+] to take a drink, to empty a glass (or bottle) by drinking its contents.

lower one’s belt (v.)

see under belt n.

lower the bomb (v.)

see under bomb n.

lower the boom (on) (v.) (also drop the boom (on)) [naut. imagery] [1930s+] (US)

1. to hit hard; to knock out.

2. to give up on.

3. to take decisive action against.

4. to reprimand severely, to put an end to someone’s misbehaviour.

5. to murder, to kill.

6. (Aus.) of a man, to have sexual intercourse.