leave (one's) guard down

(redirected from left guard down)

leave (one's) guard down

To become less guarded or vigilant; to stop being cautious about potential trouble or danger. We'll wait long enough for them to leave their guard down before we launch our invasion. There will always be people in this business looking to exploit you, so you can never leave your guard down.
See also: down, guard, leave
References in periodicals archive ?
But as you probably know, it takes a lot to keep the Patriots starting left guard down.