Meaning: If you let someone in, you allow them to enter a room or a building.Synonym: admit (formal)
- let sb/sth in Just a moment while I let the cat in. I can hear her scratching at the front door.
- let sb/sth in He left the key under a pot in front of the house so we could let ourselves in.
The guards wouldn't let us in the courtroom, so we had to