kāi​qiào

mature

开窍 (開竅) kāi​qiào
mature adjective
to start to understand things properly or become intellectually and socially aware

The child used to be very naughty, but he seemed to suddenly wise up in junior high.

understand adjective
to suddenly grasp a concept, get a situation straight, or have a flash of insight

After hearing what you said, I finally truly understand.

Frequency

Movie subtitles
1.34 per million appears in 1% of films
Written text
1.38 per million

Sources

Definitions
CC-CEDICT