1. （声音）响亮的；（声源）发出响亮声音的；吵闹的
    If a noise is loud, the level of sound is very high and it can be easily heard. Someone or something that is loud produces a lot of noise.

    e.g. Suddenly there was a loud bang...
           忽然传来一声巨响。
    e.g. His voice became harsh and loud...
           他提高了嗓门，嗓音也刺耳起来。

2. （对某事的支持或批评）强烈的，激烈的
    If someone is loud in their support for or criticism of something, they express their opinion very often and in a very strong way.

loud

    e.g. Mr Adams' speech yesterday was very loud in condemnation of the media...
           亚当斯先生在昨天的演讲中痛斥媒体。
    e.g. Mr Jones received loud support from his local community.
           琼斯先生获得了他所在社区民众的热烈支持。

3. （尤指衣服）大红大绿的，花里胡哨的，俗艳的
    If you describe something, especially a piece of clothing, as loud, you dislike it because it has very bright colours or very large, bold patterns which look unpleasant.

    e.g. He liked to shock with his gold chains and loud clothes...
           他喜欢戴金链子，穿花里胡哨的衣服来招人反感。
    e.g. I once paid £120 for an extremely loud shirt which I've yet to wear.
           我曾经花120英镑买了件极为花哨的衬衣，但到现在也没穿过。

4. 清晰明了；清楚明白
    If you tell someone something loud and clear, you are very easily understood, either because your voice is very clear or because you express yourself very clearly.

    e.g. Lisa's voice comes through loud and clear...
           丽莎的声音非常清楚。
    e.g. The message is a powerful one, and I hope it will be heard loud and clear by the tobacco industry.
           这是一个很强烈的信息，我希望烟草业能明白无误地听到。

5. 出声地；大声地
    If you say or read something out loud, you say it or read it so that it can be heard, rather than just thinking it.

loud的解释

    e.g. Even Ford, who seldom smiled, laughed out loud a few times...
           即使是很少笑的福特，有几次也笑出声来。
    e.g. He began to read out loud.
           他开始大声读起来。

6. for crying out loud -> see cry