Keel over
From Fresh Dictionary
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English
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Verb
to keel over (transitive and intransitive)
- (nautical) of a vessel to roll so far on its side that it cannot recover; to capsize
- (idiomatic{{#if:|, {{{2}}}{{#if:|, {{{3}}}{{#if:|, {{{4}}}{{#if:|, {{{5}}}{{#if:|, {{{6}}}{{#if:|, {{{7}}}{{#if:|, {{{8}}}{{#if:|, {{{9}}}}}}}}}}}}}}}}}}}) To collapse in a faint; to black out.
- We should all go inside, before somebody keels over from the heat.