let in = allow to enter
- My overcoat has a hole and lets in water.
- Your boots let in water in the rain. You should buy a new pair.
- The light in that room was impressive. There were four windows, one on each wall, that let in sunlight from all directions.
- Open the windows. Let some fresh air in.
- Open the door! Let me in!
- Please, let me in. I want to apologise.
- Who let you in? I didn 't hear the doorbell.
- Don 't let the children in if they don 't clean their shoes first.
- This nice window on the roof lets air and light in all day.
- I took his keys and told him not to come to my house again. Still, when I was away, he let himself in.