Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
as-sŭo (ads-), ĕre, v. a., to sew on, patch on: inceptis gravibus plerumque purpureus adsuitur pannus, Hor. A. P. 16 K. and H.: adsumentum vestimento veteri adsuere, Vulg. Marc. 2, 21.