(figuratively, somewhat vulgar) ball-buster; pain; pain in the arse (someone who is irritating)

(figuratively, very informal) dangerous, risky, dodgy

(figuratively, very informal) a dangerous, slippery place, passage or obstacle

(figurative) heartbreaker; lady-killer, man-killer

(slang, of a man) junkyard dog

plural of chien de la casse

(typography, search engines) case-insensitive

(typography, search engines) case-sensitive

(informal) it's make-or-break time, it's a sink or swim situation, it's touch and go

the jug goes to the well until it breaks, the pitcher goes so often to the well that it is broken at last