Blue Moon イディオム
once in a blue moon
rarely We go out for Italian food once in a blue moon although we enjoy it very much.
Blue Moon
A rare event or occurance.
once in a blue moon|blue|blue moon|moon|once
adv. phr. Very rarely; very seldom; almost never.
Coin collecting is interesting, hut you find a valuable coin only once in a blue moon. Once in a blue moon someone grows a very pale marigold, but no truly white marigolds have been raised.blue moon
A long, admitting vague, aeon of time. Often acclimated in the byword "once in a dejected moon." I haven't apparent you in dejected moon, Pete! What are you accomplishing these days?Learn more: blue, moon
Dictionary