a sudden storm on a calm sea—unforeseen trouble; a bolt from the blue; a crisis out of nowhere; an unlucky stroke fate; a sudden and unexpected turn of events; cause a commotion for nothing;flutter the dove-cot;unexpected accident ❍ 想不到～送了命！ 谁奉养，白发苍苍二老双亲！ (朱素臣《十五贯》25) An unlucky stroke of fate and my life is forfeit! Who will care for my white-haired parents now?/他们认为只有这样“平地起风波”，故意制造党内斗争，才算是“布尔什维克”。(刘少奇《论共产党员的修养》72) They con sidered that to stir up trouble out of nothing or deliberately concoct inner-Party struggle was the only “Bolshevik” way.
平地风波ping di feng bo
unforeseen trouble
平地风波pínɡ dì fēnɡ bō
平地：平坦的土地；风波：指事故或变故。比喻突然发生的事故或变故，也比喻无中生有。unforeseen trouble, a bolt from the blue, make sth. out to nothing, a flutter in the dovecote