"keel over : (intransitive, nautical, also figuratively) Of a vessel: to roll so far on its side..."

“keel over : (intransitive, nautical, also figuratively) Of a vessel: to roll so far on its side that it cannot recover; to capsize or turn turtle.
(intransitive, idiomatic) To collapse in a faint; to black out, to swoon.
(intransitive, idiomatic) To die.”

- https://en.wiktionary.org/wiki/keel_over

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