To give up one's seat in English is typically expressed as "to offer one's seat" or "to yield one's seat." This phrase likely originated from the practice of offering one's seat to someone who may need it more, such as an elderly person or someone who is pregnant or injured.

Here are some examples of how this phrase can be used in English:

"Please offer your seat to the elderly man who just boarded the bus."

"I yielded my seat to a pregnant woman on the train, and she thanked me with a smile."

In Chinese, this phrase can be translated as "让座" or "让出座位." Here are the same examples translated into Chinese:

"请让出座位给刚刚上车的老年男士。"

"我在火车上让出了座位给一个孕妇，她对我笑了笑。"