动词短语
中文翻译：降低
同义词：
['dim', 'lower', 'tone down', 'tone down the volume']
例句：
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1. The volume of the radio was pitched down so that only one person could hear it.
收音机的音量被调低，只有一个人能听到。
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2. The manager decided to pitch down on expenses to save money.
经理决定削减开支以节省资金。
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3. The teacher suggested that we pitch down our voices when we speak in class.
老师建议我们上课时说话声音要小一些。