Select the most appropriate meaning of the given Idiom:-

Pay off old scores 

Take revenge

The most appropriate meaning of the idiom "pay off old scores" is take revenge. The idiom comes from the idea of settling old debts or grudges. In this sense, to pay off old scores means to get revenge on someone who has wronged you in the past.

The other options are not as accurate descriptions of the meaning of the idiom. Paying off one's debt is not the same as paying off old scores. A critical test is not typically associated with the idiom "pay off old scores." Very nervous is not typically associated with the idiom "pay off old scores."