naughty child; wild kid; rambunctious child
Colloquial term for a child who is unruly, restless, or prone to rough play. Often used affectionately or with mild exasperation.
うちの暴れっ子は今日も公園で走り回っている。
Our wild child is running around the park again today.
あの暴れっ子たちを静かにさせるのは大変だ。
It's tough to keep those rambunctious kids quiet.
Derived from the verb 暴れる (あばれる, 'to act violently, to rage') with the suffix っ子 (っこ), which adds an affectionate or diminutive nuance, often used for children or small things.