xiǎn​xíng

to show one's true colors

显形 顯形 xiǎn//xíng
to show one's true colors
to reveal one's true form or nature; often used in a negative sense to mean betraying one's bad intentions
phenotype
(bound form) the observable physical properties of an organism

Frequency

Movie subtitles
0.420 per million appears in 0% of films
Written text
0.199 per million

Sources