"Say when!" ———— “够了说一声!”

英文释义
Expression used by a host when pouring liquid that means tell me when I have given you enough.

例句
My cautious grandfather always quietly said say when as he poured wine in my glass.
我谨慎的祖父在给我倒葡萄酒时总会小声地说：“够了就说一声！”