Crimping is to pinch and press down the edges of (a pie crust), esp. to seal together the top and bottom layers of pastry or to gash (the flesh of a live fish or of one just killed) with a knife to make more crisp when cooked.
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Crimping is to pinch and press down the edges of (a pie crust), esp. to seal together the top and bottom layers of pastry or to gash (the flesh of a live fish or of one just killed) with a knife to make more crisp when cooked.