n. 25B6; noun
the slope of the roof : GRADIENT, incline, angle, slant, inclination, pitch, decline, ascent, declivity, acclivity, rise, fall, tilt, tip, downslope, upslope; N. Amer. grade, downgrade, upgrade.
a grassy slope : HILL, hillside, hillock, bank, escarpment, scarp; poetic/literary steep.
the ski slopes : PISTE, run, nursery slope, dry slope; N. Amer. trail.
25B6; verb the garden sloped down to a stream : SLANT, incline, tilt; drop away, fall away, decline, descend, shelve, lean; rise, ascend, climb.
25A0; slope off (informal) LEAVE, go away, slip away, steal away, slink off, creep off, sneak off; informal push off, clear off.