Debuffing is still battlefield control that temporarily takes part of the enemies out of the fight, or partly takes them out of the fight for the whole fight. Killing is only technically "battlefield control".

There have been plenty of good magical examples, so I'll add some martial ones: grapple, trip, disarm, stun, sunder, bull rush. Overrun can qualify too if it knocks the opponent over, but it's more like tactical movement. All of these disable or partly disable enemies. They tend to be single target, but you get 1 per attack so it is possible to get multiple per round. They also tend to trigger AoO's when and improved trip even gives you an attack back right away. Various weapons give bonuses or otherwise aid these attacks. Some items like nets, tanglefoot bags, smokesticks and various magic items can be used for battlefield control as well.