mare2Pronunciation: /mɛː/Translate mare | into French | into German | into Italian | into Spanish Definition of mare noun British informal a very unpleasant or frustrating experience:this week is going to be a bit of a mare but at least the end is in sight (especially in sport) a very poor performance:Eboue had an absolute mare down the right hand sideOrigin: 1990s: abbreviation of nightmaremare in other Oxford dictionaries Definition of mare in the US English dictionary