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zero hour
- the exact time when an attack or other military action will
start The air force planes waited until zero hour in order to start
out on their bombing mission.
zero hour
- the time when an important decision or change is supposed to
come We waited for zero hour and the time when the new computer system
was supposed to begin operating.
zero in on
- adjust a gun so that it will hit a target, aim
at The soldiers zeroed in on the target and began to fire their guns.
zero in on
- give one`s full attention to We spent the morning
zeroing in on the problem of what to do with the excess space in our office.
zonk out
- fall asleep very quickly As soon as I got home last
night I immediately zonked out.
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