with interest

Bonds or securities paying accrued interest to the bearer. When sold, the buyer pays any interest accrued since the last payment date, in addition to the market price.

With more than what one should receive, extra, and then some. For example, Mary borrowed Jane's new dress without asking, but Jane paid her back with interest--she drove off in Mary's car. This idiom alludes to interest in the financial sense. Its figurative use dates from the late 1500s.