sudden/ˋsʌdṇ; ˈsʌdn/adj 1 happening quickly, when you are not expecting it 突然的﹐忽然的: a sudden change in the weather 天气的突然变化She felt a sudden rush of anger. 她感到一阵怒火突然涌上来。2 all of a sudden suddenly 突然地: All of a sudden, the lights went out. 突然﹐灯灭了。 —suddenness n [U]