ボキャブラリー

out of the blue

突然(とつぜん)

サムラワールド辞書

(1) 熟語
A complete surprise : something totally unexpected.
完全(かんぜん)(おどろ)き:まったく予期(よき)しない(なに)か。

  1. She contacted her old boyfriend out of the blue. Even she did not really understand why.

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