Is Arc considered obscure?

Michigan, Idaho, Montana, North Dakota, and South Dakota

62 years old. Boarding just a little (bunny slope) once or twice a year. Heading up next week.

He was, of course, the cop.

"Kushner admitted to paying a prostitute to seduce a brother-in-law and have their sexual encounter videotaped. Kushner then sent the tape to his sister in an effort to intimidate her against becoming a witness in the federal investigation.*

What’s the correct usage? and the wrong one you’ve been hearing?