ばたんばたん

Reduplication of the single-impact onomatopoeia ばたん, which mimics one loud slam or bang. The doubled form ばたんばたん emphasizes repetition — the sound happening over and over.

Can be used with or without the particle と before a verb: ばたんばたん鳴(な)る or ばたんばたんと鳴(な)る.

Related onomatopoeia

• ばたん: a single loud slam (one door closing hard)
• バタバタ: frantic rushing around; flapping, fluttering
• ガタガタ: rattling, clattering (lighter impacts, often metallic or loose objects)
• ドンドン: pounding, knocking heavily
• バンバン: banging, hitting hard (often with hands or fists)

Usage

Most naturally describes doors, shutters (雨戸(あまど)), gates, or lids being slammed. Less common for hitting people or objects directly — バンバン or ドンドン are more natural for those.