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（車）；撞毀，撞壞；墜毀

[ I or T, usually + adv/prep ] to hit something, often making a loud noise or causing damage（使）猛撞（常發出巨大聲響或造成破壞）

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

B2 [ I ] If a computer or system crashes, it suddenly stops operating.（計算機或系統）癱瘓，死機

[ I ] informal to sleep at someone else's house for the night, especially when you have not planned it（尤指事先無計劃而留在别人家裏）過夜，睡覺

[ T ] informal to go to a party or other event without an invitation（未經邀請）擅自闖入（聚會等）

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

B2 a sudden loud noise made when something breaks or falls（物體破裂或掉落時發出的）咔嚓聲，嘩啦聲

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

a situation when a computer or system suddenly stops operating（計算機或系統的）突然癱瘓，死機

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