vt. 打;打败
vi. 打;打败;拍打;有节奏地舒张与收缩
n. 拍子;敲击;有规律的一连串敲打
adj. 筋疲力尽的;疲惫不堪的
n. (Beat)人名;(德)贝亚特
It is usual, in beating the time of a piece of music, to mark or signalize the commencement of every measure by a downward movement or beat of the hand, or of any other article that may be used for the purpose .... ["Godfrey Weber's General Music Teacher," 1842]Earlier in music it meant a sort of grace note:
BEAT, in music, a transient grace note, struck immediately before the note it is intended to ornament. The beat always lies half a note beneath its principal, and should be heard so closely upon it, that they may almost seem to be struck together. ["The British Encyclopedia," London, 1809]