nod

Noun
  1. A sign of assent or salutation or command (synset 107289021)
  2. The act of nodding the head (synset 100337256)
Verb
  1. Express or signify by nodding (synset 200900197)
    "He nodded his approval"
  2. Lower and raise the head, as to indicate assent or agreement or confirmation (synset 200899973)
    "The teacher nodded when the student gave the right answer"
  3. Let the head fall forward through drowsiness (synset 200016695)
    "The old man was nodding in his chair"
  4. Sway gently back and forth, as in a nodding motion (synset 201881778)
    "the flowers were nodding in the breeze"
  5. Be almost asleep (synset 200016566)
    "The old man sat nodding by the fireplace"

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