(informal) lignite

(chiefly UK, idiomatic) To express anger with someone in no uncertain terms when they do something wrong.

(figuratively, Britain) To bring back old problems; to dig up old trouble.

(chiefly US) To berate someone at length, usually from a position of authority or moral authority.

Synonym of haul someone over the coals

To excite remorse in someone by returning good for evil.

(idiomatic) Something whose sensitivity to adverse conditions makes it a useful early indicator of such conditions; something which warns of the coming of greater danger or trouble by a deterioration in its health or welfare.

Alternative form of canary in a coal mine

plural of canary in the coal mine

plural of canary in a coal mine