I / illapsus
noun

illapsus

gen. illapsūs · gender masculine · decl. 4th
(), , illabor
a falling; gliding; flowing in
a falling, gliding, or flowing in: umoris illapsus atque exitus, Col. 2, 2, 11: serpentino illapsu, Ambros. Ep. 6, 42: gregis illapsu fremebundo territus, Sil. 3, 463.