be+on+one's+guard
21Guard rail — Guard Guard, n. [OF. guarde, F. garde; of German origin; cf. OHG. wart, warto, one who watches, warta a watching, Goth. wardja watchman. See {Guard}, v. t.] [1913 Webster] 1. One who, or that which, guards from injury, danger, exposure, or… …
22Guard ship — Guard Guard, n. [OF. guarde, F. garde; of German origin; cf. OHG. wart, warto, one who watches, warta a watching, Goth. wardja watchman. See {Guard}, v. t.] [1913 Webster] 1. One who, or that which, guards from injury, danger, exposure, or… …
23guard — or middle guard [gärd] vt. [LME garde < the n.] 1. to keep safe from harm; watch over and protect; defend; shield 2. to watch over; specif., a) to keep from escape or trouble b) to hold in check; control; restrain c) Sports to keep (an… …
24off one's guard — adjective not prepared or vigilant the blow caught him napping caught in an off guard moment found him off his guard • Syn: ↑napping, ↑off guard, ↑off guard, ↑off his guard, ↑off her guard, ↑ …
25off one's guard — off guard the explosion from the furnace room caught everyone off guard Syn: unprepared, unready, inattentive, unwary, with one s defenses down, cold, unsuspecting; informal napping, asleep at the wheel …
26on one's guard — homeowners should be on their guard Syn: 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 …
27off (one's) guard — UNPREPARED, unready, inattentive, unwary, with one s defences down, cold, unsuspecting; informal napping, asleep at the wheel, on the hop. → guard …
28drop one's guard — abandon one s habitual defensive or watchful stance. → drop …
29drop one's guard — abandon one s habitual defensive or protective stance …
30be on one's guard — be watchful, be cautious …