watch; have one's wits about one; prick up ears; be all there; have one's wits about one; keep eyes skinned; know the time of day; look out for squalls; bright to keep a bright lookout; be there; keep one's ears open (Anglophile); be on one's toes (Anglophile); be on the lookout (for sb., sth. • Officers are on the lookout for drunk drivers 24/7. ART Vancouver); be on the watch (deep in thought); keep watch; stay sharp (dharlequin); stay alert (Александр_10); have one's ears about one; have one's eyes about one; have all eyes about one; be on the alert (for Tion); be on one's guard; be vigilant (Mutabor); keep one's head on a swivel (Alex Lilo); be alert (Ambassadorik); watch out for (VLZ_58); keep one's guard up (joyand); stay focused (Johnny Bravo); be there; keep one's eyes peeled for (keep your eyes peeled for the police Рина Грант); beware (Olya34); keep an eye out for...; keep an eye out for; on one's toes

.אידיו

stay on one's toes (Featus); keep an eye open for (someone z484z); stay on alert (Artemie); have one's wits about oneself (Yeldar Azanbayev); keep one's eye on the ball; keep one's eye on the ball (Азери); keep on one's toes (Please remember that we have no idea if this guy with the explosives will be watching us, so keep on your toes and be prepared for anything. 4uzhoj); be on one's toes; keep nose to the ground (Himera); keep head on the swivel (Anglophile); keep one's eyes open (дабы избежать чего-л. нежелательного • "Just wanted to share a disturbing incident that happened around 6:30 PM near Lochdale Elementary today. While walking, three teenage boys on scooters came from behind and shot soft pellets or air beads at us using what seemed like a toy gun—for no reason. It happened so fast, we didn’t have time to react , and they later shot at a passing car as well." "Thanks. I will keep my eyes open for sure. I remember in high school a friend almost lost an eye to some idiots goofing off with pellet guns across the street." (Reddit) ART Vancouver)

.אמריק

keep eyes on the ball

.בניית

be careful (scherfas)

.טֶכנו

watch out

.לא רש

look out for the squalls (rompey); look out (Johnny Bravo); stay frosty (adamchic); keep an eye out

keep a weather eye open (Anglophile)

.שפה צ

come in hot (MikeMirgorodskiy)

Gruzovik, .מערכו

be on guard against someone or something (быть начеку́)

keep a bright lookout; prick up one's ears; be alive to the danger; have one's eyes on the ball; keep alert; keep both eyes open; keep both eyes peeled; keep both eyes skinned; keep both eyes wide open; keep one's ears open; keep one's eyes open; keep one's eyes peeled; keep one's eyes wide open; keep one's powder dry; be upon the watch; be on guard; be all there; keep one's wits about one; keep one's head on a swivel; have one's wits about one; keep one's wits about one

nix; Don't let your guard down (karulenk)

.לא רש

watch your six (проникло в разговорный язык из военного жаргона; "six" – шестичасовая отметка на воображаемом циферблате, т. е. тыл Pickman); stay sharp (ashfeathers1)

.פִּתג

keep your powder dry

.צִיוּ

check your six (происходит из военного жаргона; букв. "не забывай смотреть, что у тебя на шесть часов (т.е. сзади)" 4uzhoj)

будьте начеку

כלל.

be on your guard (Supernova); be on notice (bumble_bee); be vigilante (firefly_s)

будь начеку!

כלל.

be wary!; keep your eyes open (Aspect)

будьте начеку!

כלל.