- 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 or calk·ing or 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 calcare, 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.