Saturday-night special

noun5

1. •
   (US) An inexpensive, easily obtained handgun.
2. •
   (old-fashioned) An unexpected takeover bid that gives its opponents little time to respond.
3. •
   (US, historical) An overnight weekend train.
4. •
   (US, no longer used) A seasonal (usually October to December) sale on Saturday evening.
5. •
   (slang, no longer used) A girl who can be dated easily on Saturday evenings.