Acting in a brattish manner; behaving like a spoiled or disobedient child.
From brattish plus the gerund/present participle suffix -ing, creating a verb form that describes the action of behaving brattishly.
Unlike 'acting bratty,' which sounds deliberate and strategic, 'brattishing' suggests someone can't help themselves—it's more about uncontrolled behavior that bubbles up, which is oddly more forgivable.
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