spring ahead, fall back
A mnemonic device used to remember what way to change one's clocks as a result of daylight saving time. In the spring, clocks are set ahead by one hour; in the fall (autumn), the clocks are set back an hour. A: "We're supposed to change the clocks tomorrow. Is it an hour ahead or back?" B: "Remember, spring ahead, fall back. It's March, so they go an hour ahead."
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