/twen"tee fawr' sev"euhn, -fohr'-, twun"tee-/ , adv.
1. Slang. continually; constantly: They're together 24-7.
adj.
2. continual; constant: The manufacturer offers 24-7 customer support.
Also, twenty-four seven .
[ 1985-90; shortening of twenty-four hours a day, seven days a week ]