biàn​liǎn

face-changing

变脸 (變臉) biàn​liǎn
face-changing verb
a traditional performance technique in Sichuan Opera involving the rapid switching of masks

Face-changing is the most famous performance art in Sichuan Opera.

turn hostile verb
to suddenly change one's facial expression or attitude, often becoming angry, cold, or unfriendly

He was all smiles just a moment ago, but then he suddenly turned hostile.

Frequency

Movie subtitles
0.390 per million appears in 0% of films
Written text
3.27 per million

Sources

Definitions
CC-CEDICT