/ˈnaɪtmeə(r) ||; ˈnaɪtˌmɛr/noun[C] 1 a frightening or unpleasant dream 恶梦；梦魇: I had a terrible nightmare about being stuck in a lift last night. 昨晚我做了个可怕的恶梦，梦见给卡在电梯里了。
2 (informal 非正式) an experience that is very unpleasant or frightening 令人极不愉快或可怕的经历: Travelling in the rush hour can be a real nightmare. 在上下班的繁忙时间出门真可怕。