be on guardto be careful to avoid being tricked or getting into a dangerous situation
on (one's) guardAlert and watchful, cautious
[TahlilGaran] Dictionary of Contemporary English ▲
on one's guardVIGILANT, 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, keeping a weather eye out
[TahlilGaran] Dictionary of Contemporary English ▲