“Keep…down” 是一个常见的英语短语动词，根据不同上下文可表示“压低声音”、“控制数量/程度”或“使躺下/保持低位”等含义。
1. 基本含义
- 压低（声音、音量）：例如 “Please keep your voice down.”（请小声点。）
- 控制（数量、价格、成本等）：例如 “We need to keep expenses down.”（我们需要控制开支。）
- 使保持低位/抑制：例如 “Keep your head down during the storm.”（暴风雨期间低头趴下。）
2. 常见例句
- Keep the noise down — the baby is sleeping.
- She managed to keep her weight down by exercising regularly.
- The government is trying to keep inflation down.
3. 语法结构
“Keep + 宾语 + down” 是典型结构，其中宾语可以是名词或代词：
- Keep it down!
- Keep your hands down.
4. 小贴士
注意与 “keep down”（作不及物动词，意为“不呕吐；能消化”）区分，例如：
I couldn’t keep anything down after the surgery.