H-hour

H-hour

[eych-ouuhr, -ou-er]
noun
the time, usually unspecified, set for the beginning of a planned attack.

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

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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