mare /meə $ mer/ noun [countable]
[Language: Old English; Origin: mere]

1. a female horse or donkey ⇒ stallion, filly

2. mare’s nest
a) a discovery that seems important but is actually of no value
b) a confused situation or a very untidy place

3. British English spoken informal if someone is having a mare, things are going very badly for them at the moment. It is short for nightmare:
The Arsenal goalkeeper had a mare in the first half.

[TahlilGaran] Dictionary of Contemporary English ▲