small change

noun3

1. •
   Coins of little value kept in one's pocket or bag, ready for small purchases.
2. •
   A minor or insignificant amount of money.

   • The cost of toothpaste is small change compared to the cost of dental work.
3. •
   A person or thing of little importance or value.

   • He's a self-satisfied klutz who aspires to be a con artist. . . . Compared with Lawrence, Freddy is small change. — 1988