Sacrifice (ability)

Sacrifice or Pep Up is an ability that lets one party member die to help the party.

Final Fantasy VI
Strago can learn Pep Up.

Sabin's Spiraler Blitz acts similarly.

Final Fantasy IX
Zidane can use Sacrifice.

Final Fantasy Tactics
Uribos can use Please Eat In this case though, the target gains a level.

Final Fantasy Tactics Advance
Flans can use Sacrifice.