Moves one's head downward and upward to show agreement, understanding, or greeting.
From Old English 'nodian,' likely imitative in origin, matching the sound and movement. The meaning has remained consistent across English history.
A nod is one of humanity's most basic gestures, but it's not universal—in some cultures, shaking your head means 'yes'! It's a reminder that even our simplest body language is culturally learned.
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