やぶからぼうに
out of the blue; all of a sudden; without warning; unexpectedly
Also written やぶから棒に、薮から棒に、籔から棒に
Expression, Adverb
お前まえは首くびだ、と彼かれは藪やぶから棒ぼうに私わたしに告つげた。
He told me point-blank that I was fired.