take a powder

/T EY1 K AH0 P AW1 D ER0/
verb
  1. 1

    To leave without saying goodbye; leave quietly, run away; scram; depart without taking leave or notifying anyone, often with a connotation of avoiding something unpleasant or shirking responsibility.

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Source: https://en.wiktionary.org/wiki/take%20a%20powder