uphill battle

مثال؛
Getting a promotion in this company is an uphill battle.
In a political context, someone might say, “The candidate faced an uphill battle in winning over voters. ”
A student might describe studying for a difficult exam as “an uphill battle. ”

کار بسیار سخت و دشوار
For most people losing weight is an uphill battle

هفت خان رستم. . . کار بسیار سخت و نشدنی