cockle

(noun) common edible European bivalve.

(noun) common edible, burrowing European bivalve mollusk that has a strong, rounded shell with radiating ribs.

(verb) stir up (water) so as to form ripples. Synonyms: ripple, ruffle, riffle, undulate.

(verb) to gather something into small wrinkles or folds. Synonyms: pucker, rumple, crumple, knit. Example: "She puckered her lips."