1. to raise one's hand
それに軽く手を上げて、俺はまた足を進める。I raise my hand lightly in response and continue walking.
2. to surrender
usu. 手を上げる
囲まれた犯人は、すぐに手を上げた。Once surrounded, the criminal gave up right away.
3. to raise one's hand to someone (as a threat to strike)
usu. 手を上げる
4. to become better (at something); to improve
usu. 手を上げる
5. to throw one's hat in the ring; to volunteer; to indicate one intends to participate; to raise one's hand
usu. 手を挙げる