1
general::
Phrase(s): even steven
to be even (with someone or something) by having repaid a debt, replied in kind, etc. • Bill hit Tom; then Tom hit Bill. Now they are even steven. • Mary paid Ann the $100 she owed her. Ann said, "Good, we are even steven."
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Exactly equal; also, with nothing due or owed on either side. For example, I've paid it all back, so now we're even-steven. This rhyming phrase is used as an intensive for even. [Mid-1800s]
American Heritage Idioms