also twenty-four sevenADV: ADV after vIf something happens 24-7, it happens all the time without ever stopping. 24-7 means twenty-four hours a day, seven days a week. [mainly AM, INFORMAL]
I feel like sleeping 24-7.ADJ: ADJ n24-7 is also an adjective.
Now it is a 24-7 radio station that generates $30 million a year in advertising revenue.
English dictionary. 2008.