Verb (used without object) : They sloped gradually westward.    From Dictionary.com. 

Verb (used with object) : The sun sloped its beams. ,to slope an embankment.    From Dictionary.com. 

Noun : the slopes of Mt. Kilimanjaro.    From Dictionary.com. 

It was one of those long, low racing boats, steered with a wheel like a motor-car, and slopingly decked over in front to shield the driver.    From Wordnik.com.  [The Secret Wireless or, The Spy Hunt of the Camp Brady Patrol] Reference

Very different these from the concomitants of half a sheet of ruled paper, scrawled over as if chickens had been walking upon it, and folded slopingly, and held loosely together by a wafer!.    From Wordnik.com.  [The Continental Monthly, Vol. 4, No. 6, December 1863 Devoted to Literature and National Policy] Reference

"The cutting of a basket twig should be made slopingly within three buds of the point whence the shoot issued; and the cutting of a hoop willow may be made so low as to leave only the swell at the bottom of the shoot.    From Wordnik.com.  [Resources of the Southern Fields and Forests, Medical, Economical, and Agricultural. Being also a Medical Botany of the Confederate States; with Practical Information on the Useful Properties of the Trees, Plants, and Shrubs] Reference

Shelved slopingly with sands.    From Wordnik.com.  [Riley Love-Lyrics] Reference