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

1.
tromper, être infidèle
to be unfaithful to one's spouse or partner
:
•
He confessed to his wife that he had cheated on her.
Il a avoué à sa femme qu'il l'avait trompée.
•
She suspected her boyfriend was cheating on her.
Elle soupçonnait son petit ami de la tromper.
2.
tricher, copier
to copy from someone else or use dishonest methods to pass an exam or test
:
•
The student was caught cheating on the exam.
L'étudiant a été pris en train de tricher à l'examen.
•
It's not fair to cheat on your homework.
Ce n'est pas juste de tricher à tes devoirs.