Definition of "let in" [let in]

• To let someone or something come in; to admit someone or something in. (verb)

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• "There were a few cases of Poland Spring water and there were two frosted-over windows on the back doors and they let in just enough milky light for me to make things out."
• "His house was ten by fifteen feet, had several big window apertures to let in plenty of light, and Johnny Livingstone had made him a table and two chairs."
• "Our cabin near the sky was made of old wood full of knotholes to let in the cold and heat, or let out our cold or heat, whichever would make us most miserable."