ILLAPSE
Source: 566, 567
illapse. Illapse, n. a gradual entrance, sudden attack, false
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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.