Use 'explain yourself' when someone is being questioned or their actions seem suspicious. The teacher looked stern and said, 'You missed the deadline, explain yourself.'
Pro Tip 2/3
Defensive Tone
The phrase often implies that the speaker thinks the listener has done something wrong. After the argument, he demanded, 'Explain yourself right now!'
Pro Tip 3/3
Implies Seriousness
'Explain yourself' is used in serious situations and can feel confrontational. Her parents were waiting up for her, 'Explain yourself this instant!'