(idiomatic) A forbidden room.

(historical, cryptography, informal) A government or royal court's cryptanalyst department.

Alternative form of separate the wheat from the chaff

A device that allows a door to be partially opened from the inside, whilst preventing it from being fully opened from the outside

(nautical) Synonym of boatswain's chair

Possibly; perhaps.

plural of chain complex

(derogatory) a legal or administrative body with strict, arbitrary rulings and secretive proceedings

Alternative form of post chaise

One who chafes. / A vessel for heating water; hence, a dish or pan. / A vessel for holding burning coals or hot water used as a warmer.