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Phrase: once in a blue moon
  1. Very occasionally
    "We go to a play about once in a blue moon"

Encyclopedia: Once in a blue moon

Nearest

on trial
on your guard
on/off switch
onager
Onagraceae
onanism
onanist
once
once again
once and for all
once in a blue moon
once in a while
once more
once upon a time
once-over
onchocerciasis
oncidium
Oncidium papilio
Oncidium papilio kramerianum
oncogene
oncologic