jump off v.
1. to begin, e.g. of a military attack.
|in Knickerbocker (N.Y.) XXIX 316: It was resolved to remain one day at Fort Leavenworth, and on the next to bid a final adieu to the frontier; or in the phraseology of the region, to ‘jump off’ [DA].|
|(con. 1944) Naked and Dead 655: We’re going to be ready to jump off in fifteen minutes.|
|(con. 1950) Band of Brothers 69: We jump off at 0600.|
2. (US) to leave.
|Wolfville 18: He saddles up a pinto pony [...] an’ jumps off every now an’ then for two an’ three days at a clatter.|
|Gippsland Times (Vic.) 1 Oct. 4/1: Good-bye Mo, you’re through / [...] / You’re at the jump-off station / So Moham adieu.|
3. to happen, to start happening.
|Coll. Stories (1990) 297: I was home and in bed when that killing jumped off.‘His Last Day’ in|
|in S. Calt Rather Be Devil (1994) 96: Get half drunk off that white lighning whiskey, [...] anything was liable to jump off .|
|(con. 1960s) Black Gangster (1991) 34: When all that burning and looting jumped off in ’67.|
|🎵 Deuced it to the Bronx to rest our heads / Where a shoot out jumped off nine people lay dead.‘Six in the Morning’|
|Makes Me Wanna Holler (1995) 57: I’d risk missing lunch and dinner waiting for some action to jump off.|
|You Got Nothing Coming 50: They try to pull this lock-down shit in Kansas and the shit would’ve jumped off big-time.|
|Lush Life 36: [...] and not to get too smashed in case something did actually jump off .|
|Corruption Officer [ebk] cap. 13: The ratio of inmate to Officer was on the inmate side when things first jumped off.|
4. of a person, to start doing something.
|After Hours 31: I’m waitin’ for one of them to jump off.|
(US black) to start a career selling drugs.
|🎵 Jumped off the porch but I landed on my feet / [...] / Jumped off the porch at eleven, bitch I been bout it.‘Bout That’|