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 (against someone or something)

alert against someone or something. (*Typically: be ~; keep ~; remain ~; stay ~.) Try to stay on guard against pickpockets. I am always on my guard. Be on guard when you go into the city.

See also: guard, on

McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

on one's guard

see under off guard.

See also: guard, on

The American Heritage® Dictionary of Idioms by Christine Ammer.

on your guard

on guard

COMMON If you are on your guard or on guard, you are prepared to protect yourself against trouble. Note: Your guard is the position that you get in when you are ready to defend yourself in sports such as boxing or fencing. When Hilton came, he would have to be on his guard each second, for the man was dangerous. A journalist asked a question about his private life and instantly, the footballer was on guard. Compare with off your guard.

See also: guard, on

Collins COBUILD Idioms Dictionary, 3rd ed.

on (one's) guard

Alert and watchful; cautious.

See also: guard, on

American Heritage® Dictionary of the English Language, Fifth Edition.

See also:

on guard
on one's 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

词组	on (one's) guard
释义	on (one's) guard 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 (against someone or something) alert against someone or something. (Typically: be ~; keep ~; remain ~; stay ~.) Try to stay on guard against pickpockets. I am always on my guard. Be on guard when you go into the city. See also: guard, on McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. on one's guard see under off guard. See also: guard, on The American Heritage® Dictionary of Idioms by Christine Ammer. on your guard or on guard COMMON If you are on your guard or on guard, you are prepared to protect yourself against trouble. Note: Your guard is the position that you get in when you are ready to defend yourself in sports such as boxing or fencing. When Hilton came, he would have to be on his guard each second, for the man was dangerous. A journalist asked a question about his private life and instantly, the footballer was on guard. Compare with off your guard. See also: guard, on Collins COBUILD Idioms Dictionary, 3rd ed. on (one's) guard Alert and watchful; cautious. See also: guard, on American Heritage® Dictionary of the English Language, Fifth Edition. See also: on guard on one's 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
随便看	get out of jail get out of jail free card get out of kilter get out of mind get out of my face Get out of my face! get out of my sight get out of (one's) face get out of one's face get out of (one's) hair get out of (one's) way get out of sight get out of someone's face get out of (something) get out of sync (with someone or something) get out of system get out of the road get out of the way get out of the wrong side of (the) bed get out of this popsicle stand get out of this taco stand get out of time get out of time (with someone or something) get out of town Get out of town!