1. Literally, to stand or position oneself to the rear of someone or something. OK, Jake, you stand back of Samantha here in line. I think that's my blind date standing awkwardly in back of the statue across the square.

2. To guarantee, ensure, or show one's steadfast support of someone or something; to show such support or guarantee for someone's or something's worth, ability, performance, etc. I'm very grateful to my husband, who always stood back of me during the inquest. If your own employees won't stand in back of your new software, how can you expect the public to adopt it?