an uphill struggle/battle/task

an uphill battle

A task that is very daunting from the outset and continues to be challenging. The incumbent is so popular that defeating her will be an uphill battle. I'm terrible at math, so I have a real uphill battle ahead of me if I want to improve my grade in Algebra.
See also: battle, uphill

an uphill struggle

A task that is very daunting from the outset and continues to be challenging. The incumbent is so popular that defeating her will be an uphill struggle. I'm terrible at math, so I have a real uphill struggle ahead of me if I want to improve my grade in Algebra.
See also: struggle, uphill

an uphill task

A task that is very daunting from the outset and continues to be challenging. The incumbent is so popular that defeating her will be an uphill task. I'm terrible at math, so I have a real uphill task ahead of me if I want to improve my grade in Algebra.
See also: task, uphill
Farlex Dictionary of Idioms.

uphill battle

 and uphill struggle
Fig. a hard struggle. Convincing the senator to see our point of view was an uphill battle, but we finally succeeded.
See also: battle, uphill
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

an uphill ˈstruggle/ˈbattle/ˈtask

something that is difficult and takes a lot of effort over a long period of time: After the recent scandal, he faces an uphill struggle to win back public support before the next election.
See also: battle, struggle, task, uphill
Farlex Partner Idioms Dictionary
See also:
  • an uphill battle
  • uphill battle
  • an uphill job
  • an uphill fight
  • an uphill struggle
  • an uphill task
  • task
  • struggle
  • from the outset
  • at the outset