a mountain to climb
mountain to climb
A very difficult task or challenge. You certainly have a mountain to climb if you intend to get this project done by Thursday.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
a mountain to climbmainly BRITISH
If someone has a mountain to climb, they have to do a task which will be very difficult and will involve a lot of hard work. The negotiators have a mountain to climb if they want to bring lasting peace to this region. He still has a mountain to climb in persuading the public that war is justified.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012