A flap that hangs down behind a vehicle's wheel so that mud and other things kicked up by the wheel will hit the flap instead of a vehicle behind.

To flop or flap about.

The repeated stroke of something long and loose. / (obsolete) A coster's dance. / (obsolete) A form of somersault. / (obsolete) A cracker.

With a repeated flapping movement.

plural of mud flap

(surgery) The use of a flap made from a patient's conjunctiva to replace a damaged section of cornea.

plural of Gundersen flap

(chiefly in plural) A publishing format of a paperback book with folded flyleaves, or either of the two flyleaves so folded.

plural of French flap

(slang) The flap for defecation in a union suit.