冲撞 (chōng zhuàng) has two main uses: physically colliding with force (e.g., a boat hitting a pier) and offending or clashing with someone (e.g., through blunt speech). For physical impact, it implies a harder, more forceful hit than 撞 (zhuàng) and is less formal than 碰撞 (pèng zhuàng). For interpersonal offense, it suggests a direct, often unintentional clash, while 冒犯 (mào fàn) is a more deliberate or serious affront.