1. 灰尘;尘土;污物
    If there is dirt on something, there is dust, mud, or a stain on it.

    e.g. I started to scrub off the dirt.
           我开始擦洗上面的灰尘。

2. 泥土;尘土;松土
    You can refer to the earth on the ground as dirt, especially when it is dusty.

dirt

    e.g. They all sit on the dirt in the dappled shade of a tree.
           他们全都坐在斑驳树阴下的泥土地上。

3. (路面、地面等)土的，泥的
    A dirt road or track is made from hard earth. A dirt floor is made from earth without any cement, stone, or wood laid on it.

    e.g. I drove along the dirt road...
           我驱车沿那条土路行进。
    e.g. The rooster chased me across the dirt floor of the barn.
           公鸡追着我跑过谷仓的泥土地面。

4. 丑闻;丑事;流言蜚语
    If you say that you have the dirt on someone, you mean that you have information that could harm their reputation or career.

dirt

    e.g. Steve was keen to get all the dirt he could on her...
           史蒂夫一心想要搜罗关于她的一切丑闻。
    e.g. Both parties use computers to dig up dirt on their opponents.
           双方都用电脑搜集对手的丑事。

5. 说闲话;散布流言蜚语
    If someone dishes the dirt on you, they say bad things about you, without worrying if they are true or not, or if they will damage your reputation.

    e.g. He dishes the dirt on his buddies.
           他说自己伙伴的闲话。

6. 视…如草芥;瞧不起;轻视
    If you say that someone treats you like dirt, you are angry with them because you think that they treat you unfairly and with no respect.

dirt

    e.g. People think they can treat me like dirt!
           人们以为可以视我为草芥！