Synonyme
shake,
acceptance,
acknowledgment,
affirmative,
beckon,
bow,
dip,
greeting,
inclination,
indication,
permission,
salute,
sign,
signal,
yesEtymologie
() Of uncertain origin. The Online Etymology Dictionary dates this to the late fourteenth century, and suggests that it probably comes from Old English and may be related to Old High German hnoton (“to shake”), which, it says, is from Proto-Germanic *khnudojanan.