bathtub plug
nounUK /ˈbɑːθtʌb plʌɡ/
US /ˈbæθtʌb plʌɡ/
A small round thing that stops the water from running out of the bathtub.
She put the bathtub plug in so the water would stay for her bath.
OTHER MEANINGS
2. A rubber or plastic stopper used to block the drain of a sink or basin.
He pulled the bathtub plug out of the sink after washing the dishes.
3. A removable seal that keeps water in a container or appliance.
The old cooler had a bathtub plug at the bottom to let the melted ice out.
4. A person or thing that blocks progress or flow, used figuratively.
The broken bridge acted like a bathtub plug, stopping traffic completely.