Synonyms to on the

agile, active, acute, adroit, alacritous, alert, alive, attentive, awake, breakneck, bright, brisk, catty, dashing, deft, dexterous, dextrous, dispatchful, double-quick, eagle-winged, expeditious, express, fast, featly, fleet, flying, galloping, graceful, hair-trigger, hasty, headlong, hustling, keen, light, light of heel, light-footed, limber, lissome, lithe, lively, mercurial, neat-fingered, neat-handed, nimble, nimble-footed, on the alert, on the ball, on the job, peart, precipitate, prompt, qui vive, quick, quick as lightning, quick as thought, rapid, ready, reckless, resourceful, running, sharp, sleepless, smart, snappy, spanking, speedy, sprightly, spry, supple, sure-footed, swift, tripping, unblinking, unnodding, unsleeping, unwinking, volant, wakeful, wide-awake, winged, zippy, Klaxon, Mayday, SOS, admonish, advertent, advise, agog, air-raid alarm, alarm, alarm bell, alarm clock, alarm signal, alarum, alert for, all clear, all ears, all eyes, animated, apt, arouse, assiduous, aware, beacon, blinking light, brainy, breathe, brilliant, burglar alarm, buzz,