/dɜ:t ||; dɝt/noun [U]:
1 a substance that is not clean, such as dust or mud 污垢: His face and hands were covered in dirt. 他的脸上和手上满是污垢。
2 earth or soil 泥土: a dirt track 泥路
3 damaging information about sb 丑闻；恶意中伤的闲话: The press are always trying to dig up dirt on the President's love life. 新闻界老是想挖掘关于总统爱情生活的丑闻。
dirt cheap extremely cheap 极其便宜