But when our house burned down, he showed his true colors by inviting us to stay in his home.
show the cloven foot [hoof].
show [display. unmask. reveal] one's true colors
throw off [take off. pull off. drop] one's mask
show oneself in one's true light
betray one's true self.
reveal one's true character.
give oneself away
본색(本色)을 드러내다.
throw off ones's disguise
가면을 벗다
When he lost his temper, he showed himself in his true colors.
come out in one's true colors
show through
betray[unmask] oneself
본성이 드러나다
assume [put on, wear] a mask 가면을 쓰다. 정체를 가리다,
mask one's real character 본성을 감추다.