Meaning of clack box | Babel Free

Definitions

1. The box or chamber in which a clack valve works.
2. A person's tongue or mouth.
   UK, obsolete, slang
3. A garrulous person; a chatterbox.
   UK, obsolete, slang

Examples

“The connecting pipe between a locomotive injector and the boiler, through which the water is forced into the boiler against the steam pressure within, is provided with a "clack-valve," which allows the water to pass in the inward direction only and not the outward; this is housed in a "clack-box". No question of "advantages or disadvantages" attaches to the use of a clack-box; it is a necessary part of locomotive equipment.”

CEFR level