cockle

Short definition from Wiktionary

Noun

1. 1
   Any of various edible European bivalve mollusks, of the family Cardiidae, having heart-shaped shells.
2. 2
   The shell of such a mollusk.
3. 3
   A wrinkle, pucker
4. 4
   A defect in sheepskin; firm dark nodules caused by the bites of keds on live sheep
5. 5
   Chiefly in cockles of someone's heart: a person's innermost feelings.
6. 6
   The dome of a heating furnace.
7. 7
   The fire chamber of a furnace.
8. 8
   A kiln for drying hops; an oast.
9. 9
   The mineral black tourmaline or schorl.
10. 10
    Any of several field weeds, such as the common corncockle (Agrostemma githago) and darnel ryegrass (Lolium temulentum).
11. 11
    A £10 note; a tenner.

Verb

1. 1
   To cause to contract into wrinkles or ridges, as some kinds of cloth after a wetting; to pucker.
2. 2
   To wobble, shake; to be unsteady.