Definition
Used to indicate that one is ready to comply with a request or offer assistance immediately upon being asked.
一声令下，随时效劳
If you need any assistance, just say the word.
如果你需要任何帮助，只要说一声。
I'm ready to help anytime, you only need to say the word.
我随时准备帮忙，你只需要说一声。
If you want to end the meeting early, just say the word.
如果你想提早结束会议，只要说一声。