get it up

verb3

1. •
   (slang) To achieve or stimulate a penile erection.

   • I love my boyfriend, but am left unsatisfied because he can't get it up.
2. •
   (slang, figurative) To be enthusiastic about something; to maintain enthusiasm for something.
3. •
   (slang) To acquire enough money to pay off a debt.

   • You had better get it up before the due date.