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All day, every day. Short for "twenty-four hours a day, seven days a week." Another hyphen can be used between "four" and "seven" if used as a modifier before a noun. Often written as 24/7. You know you can call me twenty-four seven if you ever need anything, OK? It's the only shop in the entire city that's open 24/7. We offer twenty-four-seven customer support for anyone whose credit card is lost, stolen, or locked.
See also: seven
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.