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keel over (third-person singular simple present keels over, present participle keeling over, simple past and past participle keeled over)

  1. (intransitive, nautical) Of a vessel: to roll so far on its side that it cannot recover; to capsize or turn turtle.
  2. (intransitive, idiomatic) To collapse in a faint; to black out; to die.
    We should all go inside, before somebody keels over from the heat.