B1 [ I or T ] If a vehicle crashes or someone crashes it, it is involved in an accident, usually a serious one in which the vehicle is damaged and someone is hurt.撞（车）；撞毁，撞坏；坠毁

[ I or T, usually + adv/prep ] to hit something, often making a loud noise or causing damage（使）猛撞（常发出巨大声响或造成破坏）

C1 [ I ] If something such as a business crashes, it suddenly fails or becomes unsuccessful.（公司等）垮台，破产，崩溃，崩盘

B2 [ I ] If a computer or system crashes, it suddenly stops operating.（计算机或系统）瘫痪，死机

[ I ] informal to sleep at someone else's house for the night, especially when you have not planned it（尤指事先无计划而留在别人家里）过夜，睡觉

[ T ] informal to go to a party or other event without an invitation（未经邀请）擅自闯入（聚会等）

B1 an accident involving a vehicle, usually a serious one in which the vehicle is damaged or someone is hurt撞车事故；失事

B2 a sudden loud noise made when something breaks or falls（物体破裂或掉落时发出的）咔嚓声，哗啦声

C1 a sudden large fall in the value of a country's businesses狂跌；倒闭，破产

a situation when a computer or system suddenly stops operating（计算机或系统的）突然瘫痪，死机

quick and involving a lot of effort迅速全面的；速成的；应急的