- on one's guard
- adjectivevigilant-
on guard against con artists
-must remain on your guard in such a situation
• Syn: ↑on guard, ↑upon one's guard, ↑on your guard• Similar to: ↑wary* * *
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, wide awake, attentive, observant, keeping one's eyes peeled; informal keeping a weather eye out.→ guard
Useful english dictionary. 2012.