(transitive) To let someone or something come in; to admit someone or something in.
He opened the window to let in the air.
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(transitive, Oxford University slang) To associate with.
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—whi…
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(UK, slang, obsolete) To cheat or victimize.
He let me in heavily.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.