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Entry 1 sense Webster, 1913

fool around with

· fool· a·round· with · IPA
01 v. t. To manipulate (a machine or device) without proper knowledge of its operation; to experiment aimlessly with a device; as, don't fool around…
  1. 1.
    To manipulate (a machine or device) without proper knowledge of its operation; to experiment aimlessly with a device; as, don't fool around with the transit.