Meanings
any technical piece of equipment bound in front of a beast to obstruct its movement or vision, as a muzzle or twitch or barnacle (tendentially a muzzle, while a twitch preferredly bears the form Kluppe or Knuppe)
derogatorygob, mouth
Halte die Klappe!Shut your gob!/Shut up!
slangcottage, tea room (public toilet or similar place used by men seeking sex with other men, for cottaging)
archaicwhip, scourge
archaicbuckbean (Menyanthes trifoliata); also Ziegenklappe and both as a plurale tantum
Austria · archaicextension (a numerical code used to specify a specific telephone in a telecommunication network)
2 more meanings
flap; door
Am Auto befindet sich meist hinten eine kleine Klappe, hinter der sich der Tankverschluss befindet.
colloquialmouth; trap
Halt die Klappe! Dich habe ich gar nicht gefragt.