H-hour

[ eych-ouuh r, -ou-er ]
/ ˈeɪtʃˌaʊər, -ˌaʊ ər /

noun

the time, usually unspecified, set for the beginning of a planned attack.

Origin of H-hour

H (for hour) + hour; cf. D-day

Words related to h-hour

climax, contingency, crisis, crossroad, crossroads, deadline, emergency, exigency, juncture, pinch, strait, target, countdown, D-day, term

British Dictionary definitions for h-hour

H-hour

noun

military the specific hour at which any operation commences Also called: zero hour