caulk , calk
1 to stop up (cracks, crevices, etc.) with a filler
2 (Nautical) to pack (the seams) between the planks of the bottom of (a vessel) with waterproof material to prevent leakage
(C15: from Old Northern French cauquer to press down, from Latin calcare to trample, from calx heel)
caulker, calker n
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