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без предупреждения stresses
gen.	at sight (You've got your orders to shoot at sight... – Ты получил приказ стрелять без предупреждения (Status Quo Taras); at short notice; wo/nt (without notification Caithey); without further notice (pfedorov); unaware; without a word of warning (duckesa); unannounced (His mom is always dropping in on us unannounced, it gets so frustrating at times. She never calls first. – приходит к нам без предупреждения, это так раздражает порой, она никогда заранее не звонит ART Vancouver); with no notice (Julchonok); snap; pop; cold (to walk in cold for an appointment – прийти без предупреждения VLZ_58); unawares
Игорь Миг	no-notice
account.	ad nutum (inn)
adv.	without notification
amer.	on such short notice (She called the meeting on such short notice that we had no time to prepare. Val_Ships)
austral., slang	at the drop of a hat
busin.	without notice; automatically (Alexander Matytsin)
dipl.	without warning
idiom.	at a moment's notice (without need of warning. Interex)
law	without prior notice (Alexander Matytsin); without prior reference (Alexander Matytsin); without giving prior notice (Alexander Matytsin); without prior notification (sankozh)
Makarov.	out of the blue; without prior warning

без предупреждения: 76 phrases in 16 subjects

Advertising	1
Caspian	1
Economy	10
Formal	1
General	25
Idiomatic	4
Informal	2
Law	4
Makarov	12
Mass media	1
Military	9
Nautical	1
Programming	1
Security systems	1
Weapons and gunsmithing	2
Weapons of mass destruction	1