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cockle

cockle /ˈkɑːkəl/ noun
plural cockles
cockle
/ˈkɑːkəl/
noun
plural cockles
Britannica Dictionary definition of COCKLE
[count]
: a type of shellfish with a shell that has two parts and is shaped like a heart

warm the cockles of your heart

◊ If something warms the cockles of your heart, it makes you have warm and happy feelings.