zero hour
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About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.zero hour
nounDefinition of ZERO HOUR
1
a : the hour at which a planned military operation is scheduled to start b : the time at which a usually significant or notable event is scheduled to take place
2
: a time when a vital decision or decisive change must be made
See Examples of ZERO HOUR
- <we're at the zero hour, so someone has to make a decision>
Origin of ZERO HOUR
from its being marked by the count of zero in a countdown
First Known Use: 1917
Related to ZERO HOUR
- Synonyms
- boiling point, breaking point, clutch, conjuncture, crisis, crossroad(s), crunch, crunch time, Dunkirk, exigency, extremity, flash point, head, juncture, tinderbox, emergency
Rhymes with ZERO HOUR
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