1. 芽；苞；花蕾
    A bud is a small pointed lump that appears on a tree or plant and develops into a leaf or flower.

bud的解释

    e.g. Rosanna's favourite time is early summer, just before the buds open.
           罗莎娜最喜爱的季节是初夏，恰在花蕾绽放前。

2. 发芽；萌芽
    When a tree or plant is budding, buds are appearing on it or are beginning to open.

bud的翻译

    e.g. The leaves were budding on the trees below.
           下面的树正在发芽。

3. 老友；伙计；老兄
    Some men use bud as a way of addressing other men.

    e.g. You heard what the boss said, bud.
           你听见老板说的话了，老兄。

4. see also: budding;cotton bud;taste bud

5. 在发芽；长出花苞
    When a tree or plant is in bud or has come into bud, it has buds on it.

    e.g. The flowers are bronzy in bud and bright yellow when open.
           这些花的花蕾是青铜色，开放后呈明黄色。
    e.g. ...almond trees that should come into bud soon.
           很快就会开花的杏树

6. 把…消灭在萌芽状态；防（患）于未然
    If you nip something such as bad behaviour in the bud, you stop it before it can develop very far.

    e.g. It is important to recognize jealousy and to nip it in the bud before it gets out of hand.
           重要的是要甄辨出嫉妒情绪并尽早消除这种心理，以免其一发不可收拾。