Definition of twenty-four seven adverb from the Oxford Advanced Learner's Dictionary

 

twenty-four seven

 adverb
adverb
BrE
 
; NAmE
 
(also 24/7)(informal)
 
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twenty-four hours a day, seven days a week (used to mean ‘all the time’) He's on duty twenty-four seven.
See the Oxford Advanced American Dictionary entry: twenty-four seven