Tread on their toes - Idioms by The Free Dictionary
tread on (someone's) toes (redirected from tread on their toes)
tread on (someone's) toes
To insult, offend, or upset someone, especially by involving oneself in that which is someone else's responsibility. I want to help Johnny out on his project, but I know he's very proud, and I don't want to tread on his toes in any way. Look, you're going to have to tread on a few peoples' toes if you want to get ahead in this business.
tread (or step) on someone's toes offend someone, especially by encroaching on their privileges.
ˌtread on somebody’s ˈtoes (especially British English) (American English usually ˌstep on somebody’s ˈtoes) (informal) offend or annoy somebody, especially by getting involved in something that is their responsibility: Now that we have proper job descriptions we are less likely to tread on each other’s toes.