lower your guard

lower (one's) guard

To become less guarded or vigilant; to stop being cautious about potential trouble or danger. We'll wait long enough for them to lower their guard before we launch our invasion. There will always be people in this business looking to exploit you, so you can never lower your guard.
See also: guard, lower

lower your guard

or

drop your guard

COMMON If you lower your guard or drop your guard, you stop taking actions to protect yourself against trouble and you start to relax, often with bad consequences. Note: Your guard is the position that you get in when you are ready to defend yourself in sports such as boxing or fencing. The soldiers had made the mistake of lowering their guard at the precise moment when they should have been most alert. I don't like to drop my guard when I'm with my colleagues, even if I'm socializing with them. Note: You can also say that you let your guard down or let down your guard with the same meaning. Many men work in extremely competitive environments where letting down their guard could leave them vulnerable.
See also: guard, lower

lower (or drop or let down) your guard

1 relax your defensive posture, leaving yourself vulnerable to attack. 2 reduce your level of vigilance or caution.
This is an expression connected in its literal sense with boxing, as is its opposite raise your guard meaning ‘adopt a defensive posture’.
See also: guard, lower
References in periodicals archive ?
Making sure that you are not complacent and taking a few simple steps to ensure you never lower your guard is vital when it comes to beating the con artists and fraudsters.
Just like Spawn, if you're bigger than him and you lower your guard, the sucker punch will come right on in.
Settling into a routine can cause you to lower your guard and stray from basic procedures.
TUNES By John Dingwall Singles TeenCanteen You're Still Mine Our fave A BREATH of fresh air guitar-pop from the Scots all-girl quartet that will lower your guard from first beat until the last.
The moment you think you are too good for this division, you are going to get punished as soon as you lower your guard.