箭离弦 meaning in English

the arrow has left the string.; the die is cast

But having committed herself to this line of action there was no retreating for bad weather .
她既然已经箭离弦上了，那就不能因为天气不好而退回。
A word spoken is an arrow let fly
一言出口，如箭离弦。
When the signal came ， chubby was off like a rocket before i could react ， and it was all i could do to hold on
信号一发出，我还没来得及反应，查比如弩箭离弦向前奔去，我所作的只有握紧缰绳，任它奔驰。