trespass on (something)
1. To enter or intrude on private or restricted land or property. You're trespassing on my land, son—I suggest you turn around right now, or I'll blast you to pieces! He was sentenced to five years in prison for trespassing on the military installation.
2. old-fashioned To encroach or infringe upon some aspect of one's life. I'm sick of these reporters trespassing on our privacy! The horrible things I did in that war have trespassed on my dreams for years now.
trespass (up)on something
to intrude or encroach onto a restricted or private area. (Upon is formal and less commonly used than on.) You had better not trespass upon Mr. Green's land. I wouldn't trespass on that fenced-off land!
1. To enter wrongfully onto some land that belongs to another: We don't tolerate hunters who trespass on our property.
2. To infringe on something, such as another's privacy, time, or attention: Do not trespass on their patience by pursuing this matter any further.