out of nowhere
US /aʊt əv ˈnoʊˌwɛr/
UK /aʊt əv ˈnoʊˌwɛr/

1.
do nada, de repente, inesperadamente
appearing or happening suddenly and unexpectedly
:
•
The car came out of nowhere and almost hit me.
O carro surgiu do nada e quase me atingiu.
•
He just started shouting out of nowhere.
Ele simplesmente começou a gritar do nada.