B2 First Vocabulary:
Pay back
“Pay back” is a B1 level phrasal verb that means to pay someone the money that you owe them.
Below are examples of how 'Pay back' could be used in the B2 First (FCE) exam.
Reading and Use of English Part 1:
After finishing university it took my over ten years to pay (2)…… all the money that I had borrowed.
A. for
B. back
C. up
D. with
Writing Part 2:
…I can give you some money for the train ticket and you can pay me back whenever you’re able to…