bite the hand that feeds you
US /baɪt ðə hænd ðæt fiːdz ju/
UK /baɪt ðə hænd ðæt fiːdz ju/

1.
morder la mano que te da de comer, ser un desagradecido
to harm someone who is helping you or providing for you
:
•
He shouldn't bite the hand that feeds him by criticizing his boss publicly.
No debería morder la mano que le da de comer criticando a su jefe públicamente.
•
After all the help they gave him, it was shocking to see him bite the hand that feeds him.
Después de toda la ayuda que le dieron, fue impactante verlo morder la mano que le da de comer.