out of nowhere

US /aʊt əv ˈnoʊˌwɛr/
UK /aʊt əv ˈnoʊˌwɛr/
"out of nowhere" picture
1.

突然, 出乎意料地

appearing or happening suddenly and unexpectedly

:
The car came out of nowhere and almost hit me.
那輛車突然出現,差點撞到我。
He just started shouting out of nowhere.
突然開始大喊大叫。