Without boxing gloves.
The bare-knuckle boxing era ended in the early 20th century, when gloves were introduced, stricter rules implemented and oversight organizations formed.
Characterized by ruthlessly attacking or overpowering an opponent, especially when using underhanded techniques.
a bareknuckle exchange on the Senate floor
To box without boxing gloves.
...at 36 he is still able to bare-knuckle the swagger out of the biggest lumberjack in the Northwest.
To attack or overpower ruthlessly.
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“I'm not surprised,” she said, “but your will is strong and your sense of humor is great. They ought to bare-knuckle almost any problem you do have.