If you're standing at the top of a hill looking down to the bottom, you're staring down a declivity, a downward slope of any kind.

The word declivity comes from the Latin words de, which means "down," and clivus, which means "slope." If you're at the bottom of the hill looking up, you'll see the opposite of a declivity. From that position you'll be looking at an acclivity, an upward slope.

Definitions of declivity
  1. noun
    a downward slope or bend
    synonyms: declension, declination, decline, descent, downslope, fall
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    acclivity, ascent, climb, raise, rise, upgrade
    an upward slope or grade (as in a road)
    the downward slope of a hill
    a steep place (as on a hill)
    type of:
    incline, side, slope
    an elevated geological formation
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