Show in phrase
To accompany someone to show them the way into a room or building.
I've never entered this building before, so you need to show me in.
A security guard showed me in, when I told him I wanted to speak to the manager, but I didn't know the way.
If he hadn't shown me in, it would have taken me hours to find out where that room was.
To go with or accompany someone to some higher level, position, or location
Used to describe the action of accompanying one home.
1. To show or accompany someone into (somewhere), especially in an official capacity.
2. To notice or appreciate a specific trait or characteristic in someone or something.
The verb "show" must be conjugated according to its tense.
The origin of this phrase is not clear.
Used to imply that someone is acting as if he or she is demure, innocent, sincere or reserved but they may be not
Don’t be fooled by Jennie's good behaviour. She looked as if butter wouldn't melt in her mouth.