n.
1.a sign of assent or salutation or command
2.the act of nodding the head nod v.
1.express or signify by nodding
2.lower and raise the head, as to indicate assent or agreement or confirmation
3.let the head fall forward through drowsiness
4.sway gently back and forth, as is in a nodding motion
5.be almost asleep
Idiom of the Day
take (someone) by surprise
to startle someone, to surprise someone
The sudden resignation of the mayor took everyone by surprise.