tread on (someone's) 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.
See also: on, toe, tread
Farlex Dictionary of Idioms.

tread (or step) on someone's toes

offend someone, especially by encroaching on their privileges.
See also: on, toe, tread
Farlex Partner Idioms Dictionary

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.
See also: on, toe, tread
Farlex Partner Idioms Dictionary
See also:
  • (one) puts (one's) pants on one leg at a time
  • accompany (one) on a/(one's) journey
  • accompany on a journey
  • a stranger to (someone or something)
  • be out of (one's) league
  • be out of somebody's league
  • be in bad with (someone)
  • be one in the eye for
  • bargain
  • bargain for (someone or something) with (someone)