out of the blue
out
aʊt
awt
of
əv
ēv
the
ðə
dhē
blue
blu:
bloo

英語での「out of the blue」の定義と意味

out of the blue
01

occurring without prior warning 

The invitation to the party came out of the blue, and I couldn't believe my luck. 
out of the blue
01

予期せず, 突然

in a way that was not expected 
文法情報
02

突然, 予期せずに

being quiet or still or inactive 
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