Definitions from Wiktionary (cockle)

▸ noun:  Any of various edible European bivalve mollusks, of the family Cardiidae, having heart-shaped shells.
▸ noun:  The shell of such a mollusk.
▸ noun:  (in the plural) One’s innermost feelings (mostly in the expression “the cockles of one’s heart”).
▸ noun:  (directly from French coquille) A wrinkle, pucker
▸ noun:  (by extension) A defect in sheepskin; firm dark nodules caused by the bites of keds on live sheep
▸ noun:  (mining, UK, Cornwall) The mineral black tourmaline or schorl.
▸ noun:  (UK) The fire chamber of a furnace.
▸ noun:  (UK) A kiln for drying hops; an oast.
▸ noun:  (UK) The dome of a heating furnace.
▸ verb:  (transitive) To cause to contract into wrinkles or ridges, as some kinds of cloth after a wetting; to pucker.
▸ noun:  Any of several field weeds, such as the common corncockle (Agrostemma githago) and darnel ryegrass (Lolium temulentum).
▸ verb:  (Scotland, Northern England, Midlands) To wobble, shake; to be unsteady.
▸ noun:  (Cockney rhyming slang) A £10 note; a tenner.

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