once in a blue moon

informalRARELY very rarely 难得地，破天荒地

It only happens like this once in a blue moon.

这样的情况是极为罕见的。

Examples from the Corpus

once in a blue moon• I used to spend a lot of time in London, but now I only go there once in a blue moon.• We go out to eat once in a blue moon.• And Eleanor was damn lucky to have him as an escort once in a blue moon.• So now he just comes round once in a blue moon.• Once in a blue moon Eric will offer to help with the dishes, but usually he doesn't do any housework at all.• That happens only once in a blue moon, when the weather is cold enough and thus the ice thick enough.

→ once in a blue moon at once1(12)

单词	once in a blue moon
释义	once in a blue moon once in a blue moon informalRARELY very rarely 难得地，破天荒地 It only happens like this once in a blue moon. 这样的情况是极为罕见的。 Examples from the Corpus once in a blue moon• I used to spend a lot of time in London, but now I only go there once in a blue moon.• We go out to eat once in a blue moon.• And Eleanor was damn lucky to have him as an escort once in a blue moon.• So now he just comes round once in a blue moon.• Once in a blue moon Eric will offer to help with the dishes, but usually he doesn't do any housework at all.• That happens only once in a blue moon, when the weather is cold enough and thus the ice thick enough. → once in a blue moon at once1(12)
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