Grinding

Grinding is when a gamer puts in long hours performing repetitive tasks to level up their character (or complete some other achievement). For example, a World of Warcraft (WoW) player might spend hours killing the same weak enemies over and over to level up their character for a raid.

Some gamers prefer to grind away before advancing through a game's levels or story, to make progress easier. Most gamers, however, hate grinding, and they'll do it only when a game forces them to (e.g. because they've lost to the same boss three times in a row and know they need to level up).