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.
Our wild child is running around the park again today.
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.