saddle up

verb3

1. •
   To set and cinch a saddle on a horse in preparation for riding.

   • Saddle up, men! We've got a lot of riding to do today.
2. •
   To set and cinch a saddle in preparation for riding.

   • He saddled up his father's horse as usual.
3. •
   (slang) To engage in sexual intercourse.