Once in a blue moon

Posted by Tim Luo on 2007/9/20 0:09:13

This is used in order to say that something rarely or almost never happens.


I like skating, but I only get a chance to go once in a blue moon.

Eliot never had much idea of what it means to be a father, and since the divorce he just comes round to see the boys once in a blue moon.


Source: Longman Idioms Dictionary