step on toes
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step on (someone's) toes
To insult, offend, or upset someone, especially by getting involved in something that is their responsibility. I want to help John out on his project, but I know it's his baby, so I don't want to step on his toes in any way. Look, you're going to have to step on a few peoples' toes if you want to get ahead in this business.
step on someone's toesand tread on someone's toes
1. Lit. to step down onto someone's toes, causing pain. Please don't step on my toes as you walk by.
2. Fig. to offend or insult someone, as if causing physical pain. You're sure I won't be stepping on her toes if I talk directly to her supervisor? I didn't mean to tread on your toes.