occurring, engaged in, or operating after the normal or legal closing time for business:
an after-hours drinking club.
Origin
1925-30
Idioms and Phrases with after hours
after hours
After normal working hours, after closing time; also, after legal or established opening hours. For example, I haven't time while the shop is open, but I can see you after hours, or The restaurant employees sometimes stayed for a meal after hours. This term originally referred to laws governing business hours. It also gave rise to the term after-hours club, for a drinking club that remained open later than similar establishments. [ Mid-1800s ]