mare
noun /meə(r)/
  /mer/
 Idioms - a female horse or donkey母马;母驴 
- (British English, informal) a nightmare (= an experience that is very frightening and unpleasant, or very difficult to deal with)母马: 一场噩梦(一种令人恐惧,不愉快或难以应对的经历)- The journey home was a bit of a mare as all of the trains were delayed.因为所有的火车都晚点了,所以回家的旅程有点艰难。 
- I had a complete mare booking tickets for the concert.我预订音乐会门票的经历真是糟糕透顶。 
 
- The journey home was a bit of a mare as all of the trains were delayed.
词源noun Old English mearh ‘horse’, mere ‘mare’, from a Germanic base with cognates in Celtic languages meaning ‘stallion’. The sense ‘male horse’ died out at the end of the Middle English period.
Idioms 
a mare’s nest 
- a discovery that seems interesting but is found to have no value(看似有趣但)毫无价值的发现 
- a very complicated situation复杂的形势;变幻莫测的局势 - This area of the law is a veritable mare’s nest.这一法律领域复杂难料。 
 
- This area of the law is a veritable mare’s nest.