1. 杂草;野草
    A weed is a wild plant that grows in gardens or fields of crops and prevents the plants that you want from growing properly.

weed

    e.g. ...a garden overgrown with weeds.
           长满杂草的园子

2. 水草;水生植物
    Weed is a plant that grows in water and usually forms a thick floating mass. There are many different kinds of weed.

    e.g. Large, clogging banks of weed are the only problem.
           唯一的问题就是大量水草阻塞了水道。

3. 给…除杂草
    If you weed an area, you remove the weeds from it.

    e.g. Caspar was weeding the garden...
           卡斯珀正在给花园除杂草。
    e.g. Try not to walk on the flower beds when weeding or hoeing.
           拔草和锄地时尽量不要踩到花坛。

4. 烟草；大麻
    People sometimes refer to tobacco or marijuana as weed .

    e.g. Two and a half years ago I gave up the evil weed.
           两年半以前我改邪归正，不抽大麻了。

相关词组：weed out