— nine-to-fiver , n.
/nuyn"teuh fuyv"/ , adj. Informal.
1. of, pertaining to, or during the workday, esp. the hours from 9 A.M. to 5 P.M. when offices are characteristically open for business: the nine-to-five grind.
2. of, reflecting, or exhibiting a lack of willingness to work beyond the required amount of time or with more than minimal effort: With your nine-to-five mentality, you'll never get a promotion.
[ 1955-60 ]