"Fender-bends" refers to minor car accidents that only cause minor damage to the vehicle's body. The antonyms for "fender-bends" could be "serious collision," "major car crash," or "catastrophic accident." These antonyms indicate severe incidents that result in huge expenses, extensive car damage, and serious injury or even fatalities. Unlike fender-bends, these accidents could lead to legal suits, insurance claims, and medical compensations. While careless driving, over-speeding, and DUI could cause minor fender-bends, major accidents may result from weather conditions, poor road designs, and mechanical failures. It's, therefore, essential to practice good driving habits, observe traffic rules, and ensure that vehicles undergo regular maintenance to minimize accidents.