1
: to insert or embed in (a surface)
lets in diagonal sheathing at each corner of the house
2
: to involve or commit unfavorably
the provisions … could still let us in for trouble—
Elmer Davis smiled at all her schemes, little dreaming that … she was letting him in for some £20,000—Elizabeth Montizambert
3
: to share information with or allow to participate
learned a lot more … and I'll let you in on it—Rex Ingamells
: shortened and widened by the cutting and sewing in of additional pieces
—used of pelts
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Merriam-Webster unabridged
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