louse

虱子、虱复数为 lice

The doctor checked the children's hair for lice.

医生检查孩子们的头发上有没有虱子。

卑鄙小人、混蛋口语，贬义；复数为 louses

He's a louse for lying to his own family.

他竟然对自己的家人说谎，真是个卑鄙小人。

搞砸、弄糟口语，louse up

One careless mistake loused up the whole presentation.

一个不小心的失误就把整场简报搞砸了。