stray onto (some place)
To wander onto something or some place, especially when one is not supposed to be there. I keep an electrified fence around my fields to keep wild animals from straying onto it at night. Be sure not to stray onto Old Man Cratchit's land—he's liable to shoot you if he catches you!
stray onto something
to wander onto an area, such as a parcel of land. Your cows strayed onto my land and ate my marigolds! If your horse strays onto my land one more time, it's my horse!