Raising one's hand; a show of hands to indicate a desire to speak or to vote.
分からない問題があったら挙手して質問してください。
If you have a question about something you don't understand, raise your hand and ask.
会議では挙手で可否を決めた。
In the meeting, decision was made by a show of hands.
授業中、手を挙げるのが礼儀だと教えられた。
I was taught that it's polite to raise your hand during class.
答えが分かったので思わず挙手した。
I raised my hand instinctively because I knew the answer.
A salute; the act of raising a hand as a form of military or formal greeting.
式典で隊員たちは挙手の礼を行った。
At the ceremony, the troops performed a salute.
将校が挙手して隊に指示を出した。
The officer raised his hand and gave orders to the unit.