show someone in their true colors

US /ʃoʊ ˈsʌm.wʌn ɪn ðer truː ˈkʌl.ərz/
UK /ʃoʊ ˈsʌm.wʌn ɪn ðer truː ˈkʌl.ərz/
"show someone in their true colors" picture
1.

أظهر شخصًا على حقيقته, كشف عن حقيقة شخص

to reveal someone's true character, especially if it is negative or unpleasant

:
The crisis really showed him in his true colors.
الأزمة حقًا أظهرته على حقيقته.
His actions eventually showed him in his true colors to everyone.
أفعاله في النهاية أظهرته على حقيقته للجميع.