She promised to pay back the loan by the end of the month.
kindness
Frequency:
60
%
I will pay back your kindness one day.
trust
Frequency:
50
%
He wanted to pay back her trust in him.
Idiomatic Expressions for pay back
Phrase: pay back a favor
Meaning: to do something kind or helpful for someone who has done something kind or helpful for you
Usage: I want to pay back the favor you did for me by helping you with your project.