The old man died by accident.
Die of অর্থ - কোনো রোগে মরা। যেমন—He died of cancer. Die from অর্থ - কোনো কারণে মরা। যেমন—He died from overeating. Die by অর্থ - আকস্মিক বা ইচ্ছাকৃতভাবে মরা, যেমন—He died by suicide/accident. Die for অর্থ আত্মত্যাগ করা, যেমন—He died for the country ।
At best
Come into force
Die in harness
Far and wide
Over and above