нареч. on the alert, on the look-out, on the watch-out, on o.’s guard; with o.’s wits about one; wide awake; ~ съм be on the alert, be on the look-out/watch-out (for), be on o.’s guard, look out, stand by, keep a good look-out (for), be on o.’s p’s and q’s; разг. be on o.’s toes, be on the ball, keep o.’s eyes peeled, keep/have o.’s ear to the ground.