The shell of a cockle; a fragile or insubstantial object; a small, light boat.
From 'cockle' + 'shell,' explicitly naming the shell of the cockle; historically used for small boats because of their fragile, shell-like construction.
The nursery rhyme 'Rub-a-dub-dub, three men in a tub' includes cockle shells as decoration, and medieval pilgrims wore cockle shells as badges to prove they'd journeyed to Santiago de Compostela, making the shell a symbol of spiritual travel.
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