stopper

Blockage consisting of an object designed to fill a hole tightly.

An act so striking or impressive that the show must be delayed until the audience quiets down.

A remark to which there is no polite conversational reply.

(bridge) a playing card with a value sufficiently high to insure taking a trick in a particular suit.

“if my partner has a spade stopper I can bid no trump”

Close or secure with or as if with a stopper.

“She stoppered the wine bottle”

“The mothers stoppered their babies' mouths with pacifiers”