cheat on
US /tʃiːt ɑːn/
UK /tʃiːt ɑːn/
1.
to be unfaithful to one's spouse or partner
:
•
He confessed to his wife that he had cheated on her.
•
She suspected her boyfriend was cheating on her.
2.
to copy from someone else or use dishonest methods to pass an exam or test
:
•
The student was caught cheating on the exam.
•
It's not fair to cheat on your homework.