Show your true colors

(初めて)本性を現す;本音を吐く,ボロを出す


(eg) Nora: "By the way, I ran into Tim at the mall yesterday." (ところで、昨日ティムにモールでバッタリ会ったの)

Joshua: "Yeah? I don't know too much about him. He doesn't show his true colors." (そう?でも、やつの事はよく分からないよ。自分出さないからねぇ・・・)

Nora: "Is that so?" (そうなの?)