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Definition of Keel over
1. Verb. Turn over and fall. "These cars won't keel over "; "The man had a heart attack and keeled over"
Definition of Keel over
1. Verb. (intransitive nautical) Of a vessel: to roll so far on its side that it cannot recover; to capsize. ¹
2. Verb. (intransitive idiomatic) To collapse in a faint; to black out; to die. ¹
¹ Source: wiktionary.com