διαφθείρειν τὰ πράγματα

From LSJ

πένης ὢν τὴν γυναῖκα χρήματα λαβὼν ἔχει δέσποιναν, οὐ γυναῖκ' ἔτι → a poor man getting rich turns his wife into his boss, not his wife any more

Source

Greek > English (Woodhouse)

ruin one's prospects