cockle in WordNet English dictionary

1. common edible, burrowing European bivalve mollusk that has a strong, rounded shell with radiating ribs
   cockle 
   
2. common edible European bivalve
   cockle 
   

1. to gather something into small wrinkles or folds
   "She puckered her lips"
   pucker  rumple  cockle  crumple  knit 
   
2. stir up (water) so as to form ripples
   ripple  ruffle  riffle  cockle  undulate