Go-ahead signal - Crossword Clue

Below are possible answers for the crossword clue Go-ahead signal.

GREENLIGHT
NOD
  1. the act of nodding the head
  2. a sign of assent or salutation or command
  3. be almost asleep; "The old man sat nodding by the fireplace"
  4. let the head fall forward through drowsiness; "The old man was nodding in his chair"
  5. lower and raise the head, as to indicate assent or agreement or confirmation; "The teacher nodded when the student gave the right answer"
  6. express or signify by nodding; "He nodded his approval"
  7. sway gently back and forth, as in a nodding motion; "the flowers were nodding in the breeze"

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