Moving back and forth or side to side in a smooth, rhythmic way, like a tree in the wind.
From Old Norse 'sveigja', meaning to bend or turn. The word entered English through Scandinavian languages and has meant smooth, flowing movement for over a thousand years.
Humans unconsciously sway even when standing still—soldiers sway to stay alert, babies are calmed by swaying, and concert crowds move together in swaying synchronization. It's almost as if our bodies are designed to find rhythm in movement.
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