American Dictionary
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to cool by stirring, skimming, or pouring in something cold, in order to prevent it from boiling over
While greasy Joan doth keel the pot. (Shakespeare)
if a person keels over, they fall, especially because they unexpectedly feel sick
He was playing tennis one minute, and then he just keeled over.
if a ship keels over, it falls sideways
to suddenly stop working correctly
My e-mail system would keel over if I tried to send that much data.