pucker

nouns

an irregular fold in an otherwise even surface (as in cloth)
pucker, ruck

verbs

to gather something into small wrinkles or folds
"She puckered her lips"
cockle, crumple, knit, pucker, rumple
draw together into folds or puckers
gather, pucker, tuck
become wrinkled or drawn together
"her lips puckered"
pucker, ruck, ruck up