UK [ˈpʌkə(r)] / US [ˈpʌkər] verb [intransitive/transitive]
Word forms "pucker":
present tense I/you/we/they pucker he/she/it puckers present participle puckering past tense puckered past participle puckered
a) pucker or pucker up if your lips pucker, you squeeze them together and out
b) if your forehead puckers, it becomes full of lines, for example because you are thinking or because your head hurts
2) if a material puckers or is puckered, it becomes full of folds and is not flat
Phrasal verbs:

English dictionary. 2014.