A human intruder!

We have an intruder

Bill was killed by an intruder.

The dogs barked furiously at the intruder.

How can I get rid of this intruder?

Right you are, said the intruder in the former voice.

She programmed R2 to warn us if there is an intruder.

Sherlock Holmes had sprung out and seized the intruder by the collar.

For example, if we have an intruder in the cat's private space,

The body heat of an intruder will trigger it if the temperature rises one degree.

All right, said the intruder, as it seemed in a low voice curiously different from the huskiness of its first inquiry.

He sees an intruder in his territory, and it's coming all the time and he's there, so there is no end to it.

Whereas we tend to view it as an intruder, a stranger, certainly an organ whose powers need to be limited or defined and constrained, the Chinese don't see the state like that at all.

It's what's known as a bioluminescent burglar alarm, and just like the alarm on your car or your house, it's meant to cast unwanted attention onto the intruder, thereby either leading to his capture or scaring him away.

like a guest in the kitchen, it approaches the intruder closely sticking to the wall, dragging its tail along the wall just to make sure everything is fine, the house is still there, and everything is under control.

Suddenly an unmistakable cat owl from very near me, with the most harsh and tremendous voice I ever heard from any inhabitant of the woods, responded at regular intervals to the goose, as if determined to expose and disgrace this intruder from Hudson's Bay by exhibiting a greater compass and volume of voice in a native, and boo hoo him out of Concord horizon.