Definitions of encroach

to gradually take away someone else's rights; to take more of someone's time, work, etc than you should; to trespass; to intrude

Mr Li said any co-operation between the three would encroach on China's sovereignty.

to unlawfully take away more and more of another person's land, property or authority, sometimes by gradual steps

Ms Wingrave said she welcomed the £1.2bn development so long as it did not encroach on the conservation area.