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to let the head fall slightly forward with a sudden, involuntary movement when sleepy. to doze, especially in a sitting position:
Missing: Sca_esv e08c057435075756
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to move the head down and then up again quickly, esp. to show agreement, approval, or greeting: [ I/T ] The teacher nodded (his head) in agreement.
Missing: Sca_esv e08c057435075756