Reveille has military origins, signifying a regimented, disciplined start to the day. The cadets disliked the shrill tune of reveille but appreciated the order it brought.
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Morning Routine
It's associated with morning activities and routines, symbolizing a new day's beginning. Even long after service, he followed a reveille-like morning routine.
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Used Figuratively
Reveille can be used figuratively to mean any start or awakening. The shocking news served as a reveille for the unprepared team.