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or 24‐7, 24×7, twenty-four seven

[twen-tee-fawr sev-uh n, ‐fohr‐, twuhn-tee‐] /ˈtwɛn tiˌfɔr ˈsɛv ən, ‐ˌfoʊr‐, ˈtwʌn ti‐/ Slang.
continually; constantly:
They're together 24/7.
continual; constant:
The manufacturer offers 24/7 customer support.
Origin of 24/7
1985-90; shortening of twenty-four hours a day, seven days a week Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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24/7 in Culture

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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Slang definitions & phrases for 24/7

twenty-four seven

adverb phrase

Twenty-four hours a day seven days a week; always: they founded 24-7: Notes from the Inside. (The title, if you have been living under a rock, refers to being locked up 24 hours a day, 7 days a week)/ If I could I would stay on vacation twenty-four-seven

[late 1980s+; said to have been initiated by street gangs selling crack cocaine, available always]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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