puck‧er /ˈpʌkə $ -ər/ (also pucker up) verb
[Date: 1500-1600; Origin: Probably from poke 'bag' (13-20 centuries), from Old North French; ⇒ pocket¹]

1. [intransitive and transitive] if part of your face puckers, or if you pucker it, it becomes tight or stretched, for example because you are going to cry or kiss someone:
Her mouth puckered, and she started to cry.

2. [intransitive] if cloth puckers, it gets lines or folds in it and is no longer flat
—pucker noun [countable]
—puckered adjective

[TahlilGaran] Dictionary of Contemporary English ▲