Uphill miss:

An uphill miss is a ranged attack or projectile that has a chance to miss when the attacker is firing up a slope toward a target on higher ground. In Dota 2, this terrain-based miss chance affects positioning and can make high-ground defense stronger, especially around ramps and cliffs.

Players use the term when discussing fights near uneven terrain, where attacking uphill can reduce reliable damage. It is one reason teams often prefer to control high ground before starting a push or siege.

Related: High ground, Vision