caulk

US /kɑːk/
UK /kɑːk/
"caulk" picture
1.

a waterproof filler and sealant, used in building and repairing boats and in household applications.

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He applied caulk around the bathtub to prevent leaks.
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The old windows needed fresh caulk to seal them properly.
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sealantfillergroutmastic
1.

to seal (a gap or seam) with caulk.

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You need to caulk around the window frames to prevent drafts.
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The boat builders carefully caulked every seam to ensure it was watertight.
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sealfillstoppluggrout