Die by (one's) own hand negative verb phrase
To kill oneself deliberately
Vì áp lực học hành, nhiều học sinh đã tự kết thúc đời mình.
It's so sad to hear that she died by her own hand.
When being devastated and feeling hopeless, I used to want to die by their own hands.
The verb "die" should be conjugated according to its tense.
The police came to the conclusion that the man died by his own hand.
To do domething based on your emotions rather than for rational reasons
I can't believe that Tom beat his classmate. He's always the one who let his heart rule his head.