tubstopper
nounUK /ˈtʌbˌstɒpə/
US /ˈtʌbˌstɑːpər/
A tubstopper is a small plug that keeps water in the bathtub.
She pulled out the tubstopper so the water could drain away.
OTHER MEANINGS
2. A rubber or plastic stopper used to seal a sink drain.
He replaced the old tubstopper in the kitchen sink.
3. A decorative stopper attached to a chain in an antique bath.
The brass tubstopper hung from a small chain beside the faucet.
4. Any object used informally to block a drain opening.
They used a rolled-up cloth as a makeshift tubstopper.