show (one) out
To escort or accompany one to an exit. Thank you for coming by for the interview. The receptionist will show you out. I'm just going to show our guests out—I'll be back shortly.
show someone out
Also, show someone to the door. Escort someone who is leaving to the exit door, as in Thanks for coming; please excuse me for not showing you out, or Please show Mr. Smith to the door. [Second half of 1700s] Also see see out, def. 1; show someone the door.