encroach on

encroach (up)on (something)

To approach or cross a literal or figurative boundary. That fool next door totally encroached upon my land when he built his new fence. I'm sorry, I didn't mean to encroach on your authority by assigning work to your interns.
See also: encroach
Farlex Dictionary of Idioms.

encroach (up)on someone or something

to infringe or trespass on someone or something; to move into the space belonging to someone or something. (Upon is formal and less commonly used than on.) I did not mean to encroach upon your property. I need lots of space. Don't encroach on me.
See also: encroach, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

encroach on

or encroach upon
v.
To advance or extend toward or into something beyond its proper or former limits: The weeds in my neighbor's yard are encroaching on my lawn. At the edge of the village, the desert encroaches upon grassland.
See also: encroach, on
The American Heritage® Dictionary of Phrasal Verbs.
See also:
  • encroach
  • encroach (up)on (something)
  • a line in the sand
  • line in the sand
  • be as good as dead
  • draw the line
  • draw a line in the sand
  • (as) good as dead
  • at a dead end
  • knock-down drag-out fight, a