Definition
A polite response to someone who has thanked you, indicating that no thanks are necessary.
不客氣
"Thank you so much for your help!" "Don't mention it!"
「非常感謝你的幫助！」「不用客氣！」
"I really appreciate you helping me move today." "Don't mention it!"
「真的很感謝你今天幫我搬家。」「不用客氣！」
"Thank you for driving me home." "Don't mention it, it was no trouble at all."
「謝謝你開車送我回家。」「不用客氣，一點都不麻煩。」