on one's guard
Related to on one's guard: warship
on (one's) guard
Especially careful or vigilant; prepared for danger or surprises. He's got a lot of tricky moves, so be on your guard! Those trails can be a bit treacherous to climb. I just hope she's on her guard.
See also: guard, on
Farlex Dictionary of Idioms.
on one's guard
see under off guard.
See also: guard, on
The American Heritage® Dictionary of Idioms by Christine Ammer.
- on (one's) guard
- on guard
- on your guard
- always be on (one's) guard
- off (one's) guard
- off guard
- off your guard
- catch (one) off (one's) guard
- catch (one) off guard
- catch off guard