We found 3 definitions of let in from 3 different sources.
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What does let in mean?
Wiktionary
let in (Verb) To let someone or something come in; to admit someone or something in.
OmegaWiki DictionaryOmegaWiki DictionaryΩ
let in To allow participation in or the right to be part of; permit to exercise the rights, functions, and responsibilities of.
Sailor's Word-BookThe Sailor's Word-Book⛵
let in To fix or fit a diminished part of one plank or piece of timber into a score formed in another to receive it, as the ends of the carlings into the beams.
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