BT Šab 58a(44) :הכא במאי עסיקינן דמאחי מיאחא‏ : what do we deal with here? that he is stitching a stitch
See the entire entry for ˀḥy vb. D to put together; to be made related

BT Šab 58a(44) :דמאחי מיאחא‏ : where the stitching is attached
See the entire entry for myˀḥˀ n.m. stitching