uphill

[adv., adj. uhp-hil; n. uhp-hil]
adverb
1.
up or as if up the slope of a hill or other incline; upward: The soldiers marched uphill. Water does not run uphill without assistance.
adjective
2.
going or tending upward on or as if on a hill: an uphill road.
3.
at a high place or point: an uphill village.
4.
laboriously fatiguing or difficult: an uphill struggle to become wealthy.
noun
5.
a rising terrain; ascent.

Origin:
1540–50; up- + hill


4. arduous, hard, strenuous, taxing, grueling.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
uphill (ˈʌpˈhɪl)
 
adj
1.  inclining, sloping, or leading upwards
2.  requiring arduous and protracted effort: an uphill task
 
adv
3.  up an incline or slope; upwards
4.  against difficulties
 
n
5.  a rising incline; ascent

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

uphill
1613, from up + hill
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It's called heli-hiking, and once you try it, you'll never hoof it uphill for a
  view again.
One mile of uphill hiking puts you behind the falls cascading off a rock cliff.
Varied topography allows hikers to choose between leisurely strolls and
  intensive uphill climbs.
It was an uphill trudge, introducing scientific animal care.
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