1.nounA type of small boat, covered over by a surface deck, powered by the occupant or occupants using a double-bladed paddle in a sitting position, from a hole in the surface deck
2.verbTo use a kayak, to travel or race in a kayak.
"Kayaking is an Olympic sport."
3.verbTo traverse (a body of water) by kayak.
"On a dare, he kayaked the Harlem River in New York from Hell's Gate to Spyten Duyvil."