To faint,Collapse, be shocked,panic, to die
When i walked back i thought i was going to keel over
when i saw the gun i nearly keeled over
by Noxa_ June 12, 2007
to fall, collapse (from the image of a ship careening so that the keel is raised)
He looks like he could keel over at any minute.
by The Return of Light Joker December 03, 2010

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