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Definition of mare noun from the Oxford Advanced Learner's Dictionary

mare

noun
 
/meə(r)/
 
/mer/
Idioms
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  1. a female horse or donkey compare brood mare, filly, stallionTopics Animalsc2
  2. (British English, informal) a nightmare (= an experience that is very frightening and unpleasant, or very difficult to deal with)
    • The journey home was a bit of a mare as all of the trains were delayed.
    • I had a complete mare booking tickets for the concert.
  3. Word Originnoun 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
  1. a discovery that seems interesting but is found to have no value
  2. a very complicated situation
    • This area of the law is a veritable mare’s nest.
See mare in the Oxford Advanced American Dictionary

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