let in
verb1
To let someone or something come in; to admit someone or something in.
- He opened the window to let in the air.
2
To divulge one's inner thoughts to (someone), making oneself emotionally vulnerable to them; to open up to (someone).
- So tell me when you're gonna let me in / I'm getting tired and I need somewhere to begin2004, “Somewhere Only We Know”, in Hopes and Fears, performed by Keane:
3
To associate with.
Oxford University slang
- He has also been good enough to recommend to me many tradesmen who are ready to supply these articles in any quantities; each of whom has been here already a dozen times, cap in hand, and vowing that it is quite immaterial when I pay—which is very kind of them; but, with the highest respect for friend Perkins (my scout) and his obliging friends, I shall make some enquiries before "letting in" with any of them.1859, Thomas Hughes, chapter 1, in Tom Brown at Oxford:
- Related terms
- let in on