slope off, Chiefly BritishSlang. to make one's way out slowly or furtively.
Origin: 1495–1505; aphetic variant of aslope; akin to slip1
Related forms
slop·ing·ly, adverb
slop·ing·ness, noun
un·sloped, adjective
un·slop·ing, adjective
Synonyms 1.Slope,slant mean to incline away from a relatively straight surface or line used as a reference. To slope is to incline vertically in an oblique direction: The ground slopes (upward or downward) sharply here.To slant is to fall to one side, to lie obliquely to some line whether horizontal or perpendicular: The road slants off to the right.
1590s, from earlier adj. meaning "slanting" (c.1500), probably from M.E. aslope (adv.) "on the incline" (late 15c.), from O.E. *aslopen, pp. of aslupan "to slip away," from a- "away" + slupan "to slip" (see sleeve). The noun is first recorded 1610s, from the verb. Derogatory