at interest—(of money) borrowed or lent on the condition that interest is to be paid:
- The sum was placed in a bank at interest and not to be drawn before a set maturity date.
1. (of money) paid with interest included:
- The company will return your original investment to you with interest.
2. return or repay with increase or addition:
- The boys make monkey faces at me and I return the compliment with interest.