IPA: //ʌnˈpʌkər//
KK: /ʌnˈpʌkər/
To make something smooth by removing wrinkles or folds.
She used an iron to unpucker the wrinkled shirt.
Past: unpuckered
Past Participle: unpuckered
Unpucker → It is formed from "un-" (meaning not or opposite of) and "pucker" (from Middle English *puker*, meaning to gather or contract). The word "unpucker" means to reverse the action of gathering or contracting, essentially to smooth out or relax something that was previously wrinkled or folded.
Think of 'un-' meaning to reverse and 'pucker' meaning to gather or contract. So, unpucker means to relax or smooth something that was previously gathered.