stand behind (someone or something)
1. Literally, to stand or position oneself to the rear of someone or something. Okay, Jake, you stand behind Samantha here in line. I think that's my blind date standing awkwardly behind the statue across the square.
2. To guarantee, ensure, or show one's steadfast support of someone or something, or for someone's or something's worth, ability, performance, etc. I'm very grateful to my husband, who always stood behind me during the inquest. If your own employees won't stand behind your new software, how can you expect uptake by the public?