caulk (also esp US calk)

v [Tn] (a) make (esp a boat) watertight by filling the seams or joints with waterproof material （用防水材料填充缝隙或连接处）使（尤指船）不漏水. (b) fill up (esp cracks in wood) with a sticky substance 用黏性物质填塞（尤指木缝）; 泥（缝）.

catnip, cats-paw, catsuit, catsup, cattily, cattiness, cattle, cattle-cake, cattle-grid, catty, catwalk, Caucasian, caucus, caught, caul, cauldron (also caldron), cauliflower, cauliflower cheese, cauliflower ear, caulk, causal, causality, causation, causative, cause, causeway, caustic, caustic soda, caustically, cauterize, cauterize, cauterise, caution, cautionary, cautious, cautiously, cautiousness, cavalcade, cavalier, cavalry, cave,