take the gloves off
To begin to be more tenacious, aggressive, or ruthless in the way one interacts with someone else, especially in a dispute, competition, negotiation, etc. Likened to removing boxing gloves, which cushion the blows. It's time for the prosecution to take the gloves off and introduce their key witness. You can tell that she's taken the gloves off now—just look at the ferocity and focus in her eyes.
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