*1.蔓延, 占領, 侵害, 蹂躪
Because the kitchen was dirty, it was overrun by insects.
由於廚房臟, 所以害蟲在那裏大量出沒。
* 2.超過(範圍)
The advertising department has overrun its budget three years in row.
廣告部的開支已經連續三年超過預算。
* 3.（尤指壞事或不欲之事）泛濫；橫行；肆虐
* 4.多用（時間、錢財等）；超時
overflow：
*1.溢出; 淹沒
The milk is overflowing.
牛奶溢出來了。
The flood overflowed the valley.
洪水淹沒了河谷。
* 2.充滿
He always fills his glass till it overflows.
他總是把杯子斟得很滿。
The goods overflowed the warehouse.
貨倉裏裝滿了貨物。
由次可見，overrun只要是某物(如數值)超過壹定的範圍，而overflow側重表示某物(如液體)滿了、溢出了，