1. to raise one's hand
usu. 手を挙げる
2. to surrender
usu. 手を上げる
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