nod
noun
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the act of nodding the head
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a sign of assent or salutation or command
verb
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be almost asleep“I sat nodding by the fireplace.”
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let the head fall forward through drowsiness“I was nodding in my chair.”
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lower and raise the head, as to indicate assent or agreement or confirmation“The teacher nodded when the student gave the right answer”
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express or signify by nodding“I nodded my approval.”
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sway gently back and forth, as in a nodding motion“the flowers were nodding in the breeze”