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OUT OF THE BLUE | English meaning - Cambridge Dictionary
Out of the blue - Idioms by The Free Dictionary
Out of the Blue - Idiom, Origin & Meaning - GRAMMARIST
Out Of The Blue: Definition, Meaning, and Origin
Definition of 'out of the blue' - Collins Online Dictionary
Out of the blue - Definition, Meaning & Synonyms
OUT OF THE BLUE Definition & Meaning | Dictionary.com
Out Of The Blue Meaning: How to Use the Popular Phrase “Out Of ... - 7ESL
"Out of the Blue" | Origin and Meaning - Grammar Monster
out of the blue - Wiktionary, the free dictionary