incubus          
noun [ C ] uk/ˈɪŋ.kjʊ.bəs/ us/ˈɪŋ.kjʊ.bəs/  incubi /-baɪ/
 梦淫妖(传说趁女人在睡梦中与之交合的妖魔)
a male evil spirit who is believed to have sex with women while they are sleeping 
 Compare: succubus
  梦魇般的精神压力;沉重的负担
something that causes unpleasant problems for someone
  They are powerless to throw off the incubus of the past. 他们无力摆脱过去的阴影。