1
: placed, located, or built as a part of some other construction
a set-in bookcase
a set-in washbasin
2
: cut separately and stitched in
set-in sleeves
set in; setting in; sets in
: insert
especially
: to stitch (a small part) within a large article
set in a sleeve of a dress
: to become established
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Merriam-Webster unabridged
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