English

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Etymology

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May be derived from show one's true colors, but referring to showing one's bad behaviour through their anger.

Verb

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show colour (third-person singular simple present shows colour, present participle showing colour, simple past showed colour, past participle shown colour)

  1. (transitive, idiomatic, Malaysia, Singapore, colloquial) To get angry, to scowl.
    Do not show colour to me!