- 恍然大悟 [huǎng rán dà wù]
- see light suddenly; A light breaks in upon sb.; be a revelation to someone; be suddenly enlightened; be wide awake; come to understand suddenly; pulled oneself together; suddenly comprehend; suddenly realize; suddenly understand what is said [seen]
I hadn't realized that Tom was in love with Mary, but when I saw how he looked at her the penny finally dropped.
Her joke suddenly clicked with us and we all laughed.
Then the scales fell from my eyes: he had been lying all the time.