KEEL OVER

{v.} 1. To turn upside down; tip over; overturn. - Usually refers to a boat. * /The strong wind made the sailboat keel over and the passengers fell into the water./ 2. {informal} To fall over in a faint; taint. * /It was so hot during the assembly program that two girls who were standing on the stage keeled over./ * /When the principal told the girl her father died, she keeled right over./