(obsolete, derogatory) The act of talking incessantly with little or no meaning.

(engineering) A valve; especially one hinged at one edge, which, when raised from its seat, falls with a clacking sound.

The box or chamber in which a clack valve works.

plural of clack dish

(mining) The removable cover of the opening giving access to a pump valve.

(historical) A dish with a movable lid, formerly carried by beggars, who clacked the lid to attract notice. / (obsolete) Vagina or vulva.

plural of clack valve

plural of clack door

plural of clack box

plural of clicketty-clack