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bolt from the blue▼(something totally unexpected)noun[UK: bəʊlt frəm ðə bluː] [US: boʊlt frəm ðə ˈbluː]
out of the blue▼(unexpectedly)preposition[UK: ˈaʊt əv ðə bluː] [US: ˈaʊt əv ðə ˈbluː]
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