To offer or give up something valuable for the sake of something else regarded as more important or worthy. She decided to sacrifice her free time to volunteer at the local shelter.
To kill an animal or person and offer it to a deity as part of a religious ritual. In ancient times, some cultures would sacrifice animals to appease their gods.
To forfeit or give up something in exchange for a perceived greater benefit. He sacrificed his career ambitions to stay home and care for his family.
In baseball, to bunt or hit a fly ball intentionally so that a baserunner can advance while the batter is put out. He sacrificed to right field, allowing the runner on third to score.