Twenty-four-seven meaning

Alternative form of twenty-four seven.
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24-hours per day, 7-days per week. A round-the-clock service, typically including holidays, as might be offered by a supermarket, ATM, gas station, concierge service or manned data center.

They're open twenty-four seven; you can go there any time you want.

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(colloquial) Constantly, without interruption.
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Origin of twenty-four-seven

  • Shortened from "twenty-four hours a day, seven days a week."
    From Wiktionary