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

1.
engañar, ser infiel
to be unfaithful to one's spouse or partner
:
•
He confessed to his wife that he had cheated on her.
Confesó a su esposa que la había engañado.
•
She suspected her boyfriend was cheating on her.
Ella sospechaba que su novio la estaba engañando.
2.
hacer trampa, copiar
to copy from someone else or use dishonest methods to pass an exam or test
:
•
The student was caught cheating on the exam.
El estudiante fue sorprendido haciendo trampa en el examen.
•
It's not fair to cheat on your homework.
No es justo hacer trampa en tu tarea.