unstop
/ˌʌnˈstɒp/verb
(unstopped, unstopping)with obj.
1- free (something) from obstruction除去障碍; 打通：
he must unstop the sink.
他必须疏通水槽。
1.1
- remove the stopper from (a bottle or other container)拔去（瓶塞等）。