Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prō-pansus and prō-passus, a, um, Partt. [pando], spread out, extended (postclass.): propansis pinnis, App. M. 6, p. 179, 14: propassis pennis, id. Flor. p. 365, 35 (or de Deo Socr. p. 109 Hild.).
prō-pătĭor, ti, v. dep. a., to endure before (post-class.), Schol. Juv. 2, 50.