without notice, without warning, unannounced
1. occurring or done suddenly without prior notification or warning
He left sem aviso and never came back.
Ele saiu sem aviso e nunca mais voltou.
2. unexpectedly or abruptly
The boss arrived sem aviso during the meeting.
O chefe chegou sem aviso durante a reunião.
NYC Slang
out of the blue, no heads up
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