Definition of FLATTEN

to make free from breaks, curves, or bumps <flattened out the wrinkled paper before attempting to trace the pattern>
Near Antonyms coarsen, rumple, wrinkle; bend, kink; dent, pit
Antonyms rough, roughen
to defeat by a large margin <if you don't understand the rules, you're going to get flattened when you try to play>

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