take a powder
To leave without saying goodbye; to leave quietly, to run away; to scram; to depart without taking leave or notifying anyone, often with the implication of avoiding something unpleasant or shirking responsibility.
Macdonald spoke slowly, bitterly. "The kidnapping is one too many for me, Costello. I don't want any part of it. I'm takin' a powder from this toy mob. I took a chance that bright