Pronunciation: /ˈziːroʊ ˈaʊər/
noun the time at which a crucial decision or event must be made
A1 I have to wake up at zero hour tomorrow for my flight.
A2 In military terms, zero hour is the time when a military operation begins.
B1 The team worked tirelessly until zero hour to finish the project on time.
B2 Zero hour is often a stressful time for emergency responders as they prepare for a crisis.
C1 As the CEO, I had to make tough decisions at zero hour to save the company from bankruptcy.
C2 The negotiators reached a deadlock at zero hour, leading to a breakdown in the peace talks.
formal The zero hour for the project deadline is approaching, we need to work efficiently to meet it.
informal We're down to zero hour on finishing the assignment, let's get it done!
slang It's zero hour and we still haven't started studying for the exam, we're in trouble.
figurative At zero hour, he finally made the decision to change his career path and pursue his passion.
zero hours
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has been zero hour
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zero houring
zero houred