PLUNGER

US also plumber's friend, US also plumber's helper [noun] [C] - a device consisting of a cup-shaped piece of rubber on the end of a stick, which is used to remove things from a blocked pipe, esp. in a kitchen or bathroomYou use a plunger by putting the rubber piece over the opening of a blocked pipe, and moving the stick up and down, which produces pressure and suction alternately, dislodging whatever is blocking the pipe.