(transitive, obsolete) to seize, appropriate / (intransitive) to intrude unrightfully on someone else’s rights or territory / (intransitive) to advance gradually beyond due limits

(rare) Encroachment.

An entry into a place or area that was previously uncommon; an advance beyond former borders; intrusion; incursion. / An intrusion upon another's possessions or rights; infringement.

plural of encroachment

That encroaches.

present participle of encroach

simple past tense and past participle of encroach

plural of encroacher

Third-person singular simple present indicative form of encroach

One who encroaches.