Defining the values by which you live by showing narrow-mindedness, closed-mindedness or one-track mindedness.
by Mr. Terrence L. Trezvant September 25, 2003
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One definition of to "show your color" or the act of "showing your color" means to act inappropriately, (to be loud, vulgar, impetuous, out of control, undignified). It is used both humorously and seriously; when used seriously it is sometimes used to chastise or warn people that they may be letting their guard down too much or acting too comfortably. The phrase can have racial connotations, as it is used often by "people of color" to state that a person of their race is acting inappropriately, especially in front of whites or people outside of their own particular race or, thus playing into stereotypes. The phrase is used with similar connotations among one's own race at a time when "lax" or stereotypical behavior is inappropriate. At some point historically it was used by whites to mean "people of color" were acting in ways they stereotyped as indicative of their true nature of other ethnic groups, and thus was a racially derogatory phrase. Because of that the phrase can possibly be misunderstood in certain contexts.

Originally the phrase had no racial connotations; it was a variation on "showing one's color(s)" or "showing one's true color(s)", which could mean betraying ones unvarnished feelings or loyalties or affinities, or just acting impetuously, or spiritedly. Language guides indicate that the phrase is still very often used in this way as well.
"Amina, you keeping yelling to your friends and cackling; this an elegant establishment not a basement party, and you're showing your color! This is not the place to show your color, you know that."
by Language Maven January 28, 2020
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