- to stop up (the cracks, seams, etc.) of (a window frame, boat, etc.) as with a puttylike sealant or oakum
- to make (a joint of overlapping plates) tight by hammering the edge of one plate into the side of the other
Origin of caulkMiddle English cauken, to tread from Old French cauquer from Classical Latin calcare from calx, a heel: see calcar
verbcaulked, caulk·ing, caulks, also calked calk·ing calks
- To make watertight or airtight by filling or sealing: caulk a pipe joint; caulked the cracks between the boards with mud.
- Nautical To make (a boat) watertight by packing seams with a waterproof material, such as oakum or pitch.
Origin of caulkMiddle English cauken to press from Old North French cauquer from Latin calcāre to tread from calx heel
(third-person singular simple present caulks, present participle caulking, simple past and past participle caulked)
From Old Northern French cauquer, from Late Latin calicō.