intransitive verb

1. to trespass or intrude (on or upon the rights, property, etc. of another), esp. in a gradual or sneaking way
2. to advance beyond the proper, original, or customary limits; make inroads (on or upon)

Etymology: ME encrochen < OFr encrochier, to seize upon, take < en-, in + croc, croche, a hook: see crosier