practice on

practice on (someone or something)

To train for some activity by doing drills on someone or something. A noun or pronoun can be used between "practice" and "on" to specify the activity one is training for. The doctor asked if the trainees could practice checking blood pressure and heart rate on me. I want to make sure the sculpture turns out how I want it, so I've been practicing on these concrete blocks before I move on to the marble.
See also: on, practice
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

practice (up)on someone or something

to train or drill on someone or something. (In preparation for the real thing. Upon is formal and less commonly used than on.) I do not want a dental student practicing upon me. I want to learn how to braid hair. Can I practice on you?
See also: on, practice
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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Others knocked the practice on the head after evidence of pressure-selling and people paying more by switching.
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