[тж. to come out in (або show) one's true colours]
показатися, з’явитися у справжньому вигляді, виявити свої справжні наміри;
His old thoughts, convictions, likes and dislikes, things be respected and things be abhorred, appeared in their true light at last (J. Conrad).
I’ve always thought you were against me. Now you’re come out in your true colours (Th. Hardy).
Another election! Could he stand a, second time without showing his true colours? (J. Galsworthy).