Green’s Dictionary of Slang

1. a nap, a sleep.

1986		Eble Campus Sl. Mar.
2012		(con. 1980s) I. Welsh Skagboys 85: Ah’m driftin back intae a semi-crash.

2. (drugs) the (emotionally and physically demanding) return to ‘normality’ that follows drug-taking.

1970		Arizona Republican (Phoenix, AZ) 17 Feb. 14/6: When the effects of speed wear off, the users experiences what he calls ‘the crash’ [...] characterized by physical exhaustion [...] a craving for more speed and by depression, confusion, panic and some pain.
2001		J. Stahl Plainclothes Naked (2002) 209: Mac had only seen him like this when they ran out of crack with no alcohol to cut the crash.
2015		Baltimore Sun (MD) 15 Apr. T29/2: It’s really the kind of shit that I hate — big lift, big crash, all quick.
2023		(con. 1962) J. Ellroy Enchanters 65: Jungle juice. It wears you down. The flight decrees the crash.

3. see crash-pad n.