cheat on
US /tʃiːt ɑːn/
UK /tʃiːt ɑːn/

1.
出轨, 背叛
to be unfaithful to one's spouse or partner
:
•
He confessed to his wife that he had cheated on her.
他向妻子坦白他出轨了。
•
She suspected her boyfriend was cheating on her.
她怀疑她的男朋友出轨了。
2.
作弊, 抄袭
to copy from someone else or use dishonest methods to pass an exam or test
:
•
The student was caught cheating on the exam.
这名学生在考试中被抓到作弊。
•
It's not fair to cheat on your homework.
抄袭作业是不公平的。