sinkstopper
nounUK /ˈsɪŋkˌstɒpə/
US /ˈsɪŋkˌstɑːpər/
A sinkstopper is a small plug that keeps water in a sink.
She put the sinkstopper in so the soapy water would not drain away.
OTHER MEANINGS
2. A person or thing that halts or blocks progress.
The new rule acted as a sinkstopper for the whole project.
3. A device used to block a pipe or drain temporarily during repairs.
The plumber used a rubber sinkstopper to seal the line.
4. A stopper fitted to the overflow opening of a basin.
He replaced the worn sinkstopper near the rim of the tub.