Plural of downhill; the plural form can refer to multiple downward slopes or multiple instances of descending mountainous terrain.
Plural form of 'downhill,' which combines 'down' (Old English 'dūn') and 'hill' (Old English 'hyll'). The compound emerged to describe the literal direction of travel on sloped terrain.
Interestingly, 'downhill' became a metaphor for decline or deterioration (as in 'it's all downhill from here'), so we're using geography to describe life's misfortunes!
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