flapper: the rubber flap at the bottom of the toilet tank, which lifts when the handle is depressed, allowing water to flow into the tank. It closes when the handle is released, allowing the tank to refill for the next flush.
Flapper
flapper: the rubber flap at the bottom of the toilet tank, which lifts when the handle is depressed, allowing water to flow into the tank. It closes when the handle is released, allowing the tank to refill for the next flush.