The Collaborative International Dictionary
Illapsing
Illapse \Il*lapse"\, v. i. [imp. & p. p. Illapsed; p. pr. &
vb. n. Illapsing.] [L. illapsus, p. p. of illabi; pref. il-
in + labi to fall, slide.]
To fall or glide; to pass; -- usually followed by into.
--Cheyne.
Wiktionary
illapsing
vb. (present participle of illapse English)