caulk
verbUK /kɔːk/
US /kɔk/
To fill small holes or cracks with a soft material so water cannot get in.
Dad used a tube of sealant to caulk the cracks around the bathtub.
OTHER MEANINGS
2. To make a boat's seams watertight by filling them with a special material.
The sailors caulked the wooden hull before setting out to sea.
3. A soft material used to fill cracks and gaps.
He bought a tube of caulk at the hardware store.
4. To fill a gap or hole in a surface, such as a wall or window frame.
We need to caulk the window frames before winter arrives.