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to give a signal to begin; to tell someone that you will do what they want at the time they ask you
给一个开始的信号;吩咐一下，说一声，表示一下
If you need any help, just say the word.
需要我们帮忙你就说。
You only have to/Just say the word, and I'll come and help.
你只要说一声，我就会来帮忙。
I'm ready to start any time you say the word.
只要你说一声，我就准备开始。