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быть настороже stresses
gen.	be on guard; look out (look out! – осторожнее!, берегись!); be on one's guard; be on the alert (I began to see that I would have to be on the alert for sudden switches of subjects in Mr. Quadrocelli's conversation. (I. Shaw)); on the alert; be on the look-out; be ready at call; have all eyes about one; keep ears open; keep eyes open; know the time of day; look out for squalls; keep one's ears open (Anglophile); have one's wits about one; keep watch; look out; stay alert (Александр_10); be on the defensive (weary and ready to defend oneself КГА); raise a red flag (4uzhoj); be alert (to Andrey Truhachev); watch; look over one's shoulder (ДШБ); be on alert (Andrey Truhachev); be on guard; be on the look-out; keep a weather eye open (Taras); be on the outlook; be ready at a call; be on the guard; stand upon one's guard; be upon the hover; look about; be on the nose; ward; keep one's watch; on one's toes
Игорь Миг	be on one's toes
amer.	keep eyes on the ball
fig.	stand a tiptoe; stand on tiptoe
idiom.	keep an eye out (Ballistic)
inf.	be careful (be cautious Val_Ships); look out for the squalls (rompey); buck ideas up
Makarov.	be on the outlook; be on the lookout for (for); be on the watch; be upon the watch; keep one's eyes peeled; watch out
Makarov., amer.	cheese it
proverb	keep one's eyes peeled (SergeiAstrashevsky)
всё время быть настороже
gen.	keep alert
быть всегда настороже
gen.	keep one's eye on the ball (If you want to get along in this office, you will have to keep your eye on the ball Taras)

быть настороже : 7 phrases in 3 subjects

General	2
Informal	1
Makarov	4