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to move the clock ahead
01
to adjust the time on a clock by advancing it forward, typically by one hour, to accommodate the start of daylight saving time
Example
Let's move the clock ahead before we go to bed so we're not late tomorrow.
Every spring, we need to move the clock ahead by one hour to ensure our timekeeping is in sync with daylight saving time.
I always forget to move the clock ahead, so I end up being an hour early for appointments when daylight saving time begins.
