expression
curses come home to roost; if you curse someone, dig two graves
Proverb warning that wishing harm on others will bring harm upon oneself. The literal image is that if you curse someone, you must dig two graves: one for the target and one for yourself.
「人を呪わば穴二つ」ということわざがあるように、他人を恨むと自分にも悪いことが返ってくる。
As the proverb says, 'If you curse someone, dig two graves' — holding a grudge against others brings misfortune back to yourself.
A Japanese proverb of uncertain origin, possibly influenced by similar ideas in other cultures. The literal meaning is 'if you curse someone, two holes (graves)'.