The idiom "once a blue moon" means?

Important Related MCQs:

• The heavy losses in business came like a bolt from the blue. In the above sentence, the idiom "bolt from the blue" means
• The idiom 'once in a blue moon' means?
• The idiom A bolt from the blue means what?
• The idiom: "Between the devil and the deep blue sea" means what?
• Choose the meaning of Idiom/Phrase: Amna might scream blue murder, but I feel Fatima should get the promotion since she is better qualified for the job?
• Select the most appropriate meaning of the given idioms and phrasal verbs: A bolt from the blue
• Short Question: A bolt from the blue idiom means
• A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?
• A bag contains 2 yellow, 3 green, and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?
• A bag contains 3 red marbles, 2 green marbles, and 5 blue marbles. If a marble is selected at random, what is the probability that it is blue?