show one's colors

show (one's) (true) colors

To reveal what one truly believes, thinks, or wants; to act in accordance with one's real personality, temperament, or disposition. Dave said all along that he only wanted this deal because it was in the company's best interest, but he showed his true colors once he realized that he wouldn't get any special commission for his efforts. It's only in times of crisis that your friends will really show their colors.

See also: color, show

show one's colors

see under false colors; also show one's true colors.

See also: color, show