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stitch something up
to sew something together; to mend a tear or ripped seam. I tore my shirt. Would you stitch it up, please? Please stitch up my shirt.
1. To mend or repair something with or as if with stitches: The tailor stitched up the rip in the jacket. The cut over my eye was deep, but the doctor stitched it up in a matter of minutes.
2. To reach some official agreement: I've stitched up a deal with my mechanic so that I pay only for parts and not labor. The agreement was easy to make; we stitched it up in a day.