keel over

To suddenly fall over or tip sideways, like when someone faints.

"It was so hot at the outdoor concert that two people keeled over and had to be helped off the field."

Hear it in context

Mark Cuban’s Blueprint for Startup Success | Aspire with Emma Grede

Emma Grede · 87:59

I'm just going to like keel over one day like mid

1989: Anything That Makes a Noise | Ulster in Focus | BBC Archive

BBC Archive · 15:43

to carry everything on, which had a tendency to keel over under the load.

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