Even if the interview went well, don't lower your guard or act overly familiar. (social.hays.com)
I like the idea of being able to have people lower their guard with the «Once upon a time,» you know, and then listen. (latimes.com)
Moreover, in the aftermath of surgery, the immune system concentrates most of its efforts on healing the surgical wound, lowering its guard against cancer cells. (sciencedaily.com)