nod
verb
[ nɒd ]
• lower and raise one's head slightly and briefly, especially in greeting, assent, or understanding, or to give someone a signal.
• "he looked around for support and everyone nodded"
• let one's head fall forward when drowsy or asleep.
• "Anna nodded over her book"
• head (the ball) without great force.
• "Henry nodded the ball over the line"
nod
noun
• an act of nodding the head.
• "at a nod from his father he left the room"
Similar:
signal,
indication,
sign,
cue,
gesture,
inclination,
bob,
bow,
dip,
duck,
greeting,
acknowledgement,
Origin:
late Middle English (as a verb): perhaps of Low German origin; compare with Middle High German notten ‘move about, shake’. The noun dates from the mid 16th century.