To avoid using a high level of force when punching.
Traditionally on Okinawa (if 'traditionally' is the right word to use), protectors had been worn during sparring practise because the trainees believed that, to be effective, one should not train to pull punches.
To act with reserve; especially, to word something delicately to avoid giving offense or inciting anger.
Near-synonym: mince words
Originally from boxing. First use appears c. the 1920s.
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