also rat's-tail, used since 16c. of conditions or devices held to resemble a rat's long, hairless tail in some sense, including "lank lock of hair" (1810); "end of a rope" (1867); from rat (n.) + tail (n.1).
雙語例句
1. If I don't send a picture, he will smell a rat.
如果我不寄出照片，他將有所察覺。
來自柯林斯例句
2. They were accused of encouraging children to rat on their parents.
他們被指控唆使兒童告發(fā)自己的父母。
來自柯林斯例句
3. Captain Hardnose certainly ran that rat over the hill.
哈得諾思上尉當然要求那個告密者離職了.
來自《簡明英漢詞典》
4. The lab assistant injected the rat with the new drug.