Main Entry: ¹stop·per

Pronunciation: \ˈstä-pər\

Function: noun

Date: 15th century

1 : one that brings to a halt or causes to stop operating or functioning : check: as a : a playing card that will stop the running of a suit b : a baseball pitcher depended on to win important games or to stop a losing streak; also : an effective relief pitcher
2 : one that closes, shuts, or fills up; specifically : something (as a bung or cork) used to plug an opening