adverb · absolutely or certainly, typically used before a negative for emphasis

我决不放弃这个机会。

verb · to make a judgment, decision, or determination

双方激战良久，始终胜负难决。

verb · of a dam, dyke, or riverbank, to burst or break through

由于雨量过大，河堤最终被大水冲决了。

verb · to carry out a death sentence on someone

古代判处死刑的人，往往要在秋后决。