~ 1
informal
■ exclamation (also ~ee ) expressing astonishment or admiration.
■ noun a sensational success.
■ verb impress and excite greatly.
Origin
C16: natural exclamation; first recorded in Scots.
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~ 2
■ noun Electronics slow pitch fluctuation in sound reproduction, perceptible in long notes. Compare with flutter (in sense 3).
Origin
1930s: imitative.