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

1.
morder a mão que te alimenta, ser ingrato
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.
Ele não deveria morder a mão que o alimenta criticando seu chefe publicamente.
•
After all the help they gave him, it was shocking to see him bite the hand that feeds him.
Depois de toda a ajuda que lhe deram, foi chocante vê-lo morder a mão que o alimenta.