bite the hand that feeds (someone)

Translations
кусать руку, которая кормит (кого-либо)
He should be careful not to bite the hand that feeds him.
Ему следует быть осторожным и не кусать руку, которая его кормит.
Definitions
To act against or show ingratitude toward someone who has helped or supported you, often in a way that harms your own interests.
Words
bite

verb
кусать
the

article or possessive pronoun
определённый артикль
hand

noun
рука
that

pronoun
который
feeds

verb
кормит
someone

pronoun
кого то