Question

Name the color that completes the phrase 'once in a _____ moon.

1) blue
2) red
3) green
4) yellow

Answer 1

The phrase 'once in a blue moon' is completed by the color blue, which signifies a rare event.

Step-by-step explanation:

The phrase 'once in a blue moon' refers to an event that happens very infrequently. The color that completes this phrase is blue, therefore the correct answer is option 1) blue.

The Moon's cycle of phases does not actually result in the Moon turning blue. A blue moon is a term that is commonly used to describe either the second full moon in a calendar month or the third full moon in a season that has four full moons, which is a rare occurrence, hence the phrase 'once in a blue moon' signifies a rare event.