Synonyms of on one's guard in English:

on one's guard


See definition of on guard

phrase

1‘police are urging horse owners to be on their guard’

SYNONYMS
vigilant, alert, on the alert, wary, watchful, cautious, careful, heedful, chary, circumspect, on the lookout, on the qui vive, on one's toes, prepared, ready, wideawake, attentive, observant, keeping one's eyes peeled
informal all ears, beady-eyed, on the ball, not missing a trick, keeping a weather eye on things, cagey, leery
rare regardful, Argus-eyed
ANTONYMS

inattentive