to show one's colors, to make one's intentions known
Sein wahres Gesicht, seine Meinung oder seine Absichten deutlich machen.
To clearly express one's intentions, position, or character.
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In der Verhandlung muss die Firma endlich Flagge zeigen.— The company must finally show its colors during the negotiations.
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Er hat in der Krise deutlich Flagge gezeigt.— He clearly showed his true colors during the crisis.