on your guard(s = adj.all) on guard, on one's guard, upon one's guard - vigilant; "on guard against con artists"; "must remain on your guard in such a situation"

advance guard, air national guard, arm guard, army national guard, axle guard, bank guard, body guard, bumper guard, cattle guard, coast guard, color guard, crossing guard, door guard, face guard, guard, guard against, guard boat, guard dog, guard duty, guard hair, guard of honor, guard ship, hold your horses, home guard, honor guard, in your birthday suit, keep guard, national guard, national guard bureau, off guard, off her guard, off his guard, off one's guard, off your guard, old guard, on guard, on one's guard, praetorian guard, prison guard, provost guard, red guard, republican guard, security guard, shin guard, splash guard, stand guard, u. s. coast guard, united states coast guard, up to your neck, upon one's guard, us coast guard, watch guard, yeoman of the guard, your