恍然大悟 (huǎng rán dà wù): Be suddenly enlightened — Meaning & Stroke Order

After some deep reflection, he was suddenly enlightened about the fatal flaw in his decision.

Could it be that only now are you suddenly enlightened that all of this was an elaborately designed scam?

After the teacher explained, I suddenly realized that this problem was actually so simple.

After hearing his story, I suddenly realized and understood the truth behind the matter.