keel over (third-person singular simple present keels over, present participle keeling over, simple past and past participle keeled over)
- (intransitive, nautical) Of a vessel: to roll so far on its side that it cannot recover; to capsize.
- (intransitive, idiomatic) To collapse in a faint; to black out; to die.
- We should all go inside, before somebody keels over from the heat.
of a vessel: to roll so far on its side that it cannot recover