Definition of "Crest" :

noun: a showy growth of e.g. feathers or skin on the head of a bird or other animal

noun: (heraldry) in medieval times, an emblem used to decorate a helmet

noun: the center of a cambered road

noun: the top line of a hill, mountain, or wave

noun: the top or extreme point of something (usually a mountain or hill)

verb: reach a high point

"The river crested last night."

verb: lie at the top of