What does the expression "once in a blue moon" mean?

Answer and explanation

Correct answer: D. Very rarely

  1. Step 1: An idiom has a meaning different from its separate words: "once in a blue moon" means "very rarely".
  2. Step 2: So the answer is "very rarely".
Answer
Very rarely.
Why not the others: Every night, At midnight and Very often do not fit here.

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What does the expression "once… | Tawjihi (General Secondary)