1. Down the slope of a hill.
2. Toward a lower or worse condition: The alcoholic's health went downhill fast.

1. Sloping downward; descending.
2. Sports. Of, relating to, or constituting skiing down a slope: a downhill racer.

1. A downhill skiing race.
2. A downward gradient; a descending slope.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.