Fill or close tightly with or as if with a plug:
— Stop up the leak.

synonyms: plug, secure.

Roget 261: close, occlude, plug; block up, stop up, fill up, bung up, cork up, button up, stuff up, shut up, dam up; blockade, obstruct etc. (hinder) 706; bar, bolt, stop, seal, plumb; choke, throttle; ram down, dam, cram; trap, clinch; put to the door, shut the door.    ... show more