This is the 9712th most frequent Russian word.
швейной
Sewing.
The word 'швейной' is an adjective describing the workshop, indicating it specializes in sewing or tailoring.
Она работает в швейной мастерской.
She works in a tailoring workshop.
Here, 'швейной' describes the machine, specifying its purpose for sewing.
Я купил новую иглу для швейной машины.
I bought a new needle for the sewing machine.
In this context, 'швейная' again modifies the noun 'машинка', denoting its function is related to sewing.