1 a group of feathers on the top of a bird's head 羽冠

2 a design used as the symbol of a particular family, organization, etc, especially one that has a long history （尤指有悠久历史的家族、组织等的）饰章: the family/school crest 家族╱学校饰章

3 the top part of a hill or wave 山顶；波峰: surfers riding the crest of the wave 驾于浪顶的冲浪运动员 ☞picture at wave 见wave插图