on the turn   (TTS發音)

1. about to turn or change正在轉變中

    The tide will soon be on the turn and then we can make a start. 形勢馬上會變，然後我們就可以開始幹了。

2. （of milk）on the point of becoming sour（牛奶）正在變酸

    The milk is on the turn；you'd better not drink it. 牛奶變味了，最好別喝它。