from/out of nowhere idiom
B2 突然;出人意料地
very suddenly and unexpectedly
She said her attacker seemed to come out of nowhere. 她说袭击她的人不知是从哪里冒出来的。
figurative The team has come from nowhere (= from a very bad position) to win football's biggest prize. 这支队伍排名靠后，却出乎意料地赢得了足球冠军。