[twen-tee-fawr sev-uhn, ‐fohr‐, twuhn-tee‐] Slang.
continually; constantly: They're together 24/7.
continual; constant: The manufacturer offers 24/7 customer support.
Also, 24‐7, 24×7, twenty-four seven.

1985–90; shortening of twenty-four hours a day, seven days a week

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American Heritage
Cultural Dictionary

24/7 definition

Twenty-four hours a day, seven days a week: “This convenience store is open 24/7.” The term, which also appears as “24-7,” can be used figuratively to mean “with great time and effort”: “We worked on the design 24/7 in order to complete the work on time.” This phrase was coined in the late twentieth century.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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