callous and toughened by experience

(cinematography) A technique where the top and bottom of the film frame are masked off in camera, as opposed to soft matte.

plural of hard-on

(meteorology) A freeze sufficiently long and severe to destroy seasonal vegetation and lead to ice formation in standing water and hard ground. 27°F (-3°C) is considered a threshold in the US.

Alternative spelling of diehard

(idiomatic) As hard as a bone, rock hard.

(economics) Money backed by specie and easily convertible into foreign currencies. / (US, politics) Money contributed directly to a candidate rather than to a party or committee.

Alternative spelling of diehard

(slang) A tough person. / (New Zealand, slang) An amusing, funny, witty, or possibly strange person. May be used as a term of endearment.

A type of pronunciation change required when speaking certain Celtic languages.