To raise one's hand in English is to "raise" or "put up" one's "hand". This phrase comes from the physical gesture of extending one's arm upwards to signal a desire to speak or be recognized.

For example:

"Please raise your hand if you have a question." (请举手如果你有问题)

"I raised my hand, but the teacher didn't call on me." (我举起了手，但老师没有把我叫上)

"The speakers at the meeting put up their hands to indicate they had finished their presentations." (会议上的发言人举起手来表示他们已经完成了他们的演讲)