Definition of "Chap" :
noun: (usually in the plural) leather leggings without a seat; joined by a belt; often have flared outer flaps; worn over trousers by cowboys to protect their legs
noun: a crack in a lip caused usually by cold
noun: a boy or man
"That chap is your host."
noun: a long narrow depression in a surface
verb: crack due to dehydration
"My lips chap in this dry weather."