forstop

From Middle English forstoppen, from Old English forstoppian (“to stop up, close”), equivalent to for- +‎ stop. Cognate with Dutch verstoppen (“to clog, obstruct, conceal”), German verstopfen (“to block, clog, plug, stop up”), Swedish förstoppa (“to constipate”).

forstop (third-person singular simple present forstops, present participle forstopping, simple past and past participle forstopped)

1. (transitive, obsolete) To stop up; block; clog; obstruct; (one's breath) to stifle; (a watercourse) to dam up.