Billie Eilish has told that she has Tourette Syndrome. She was interviewed by David Letterman.
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twitch is a sudden, sharp movement.
If you wiggle something, it moves up and down or from side to side in small quick movements
If you flex your muscles or parts of your body, you bend, move, or stretch them for a short time.
If something is exhausting it it makes you very tired, either physically or mentally.