Under是一个常用的英语单词，可以表示“在…下面”、“在…之下”、“在…下方”、“在…下面的位置”等含义。在口语和书面语中都经常使用。

关于under的发音，它的读音是/ˈʌndər/。其中，/ʌ/是一个元音，类似于汉语中的“短音”；/d/和/r/是辅音，发音时舌头要触碰到上颚，和汉语中的“d”、“r”相似；/ə/是一个弱读元音，发音时嘴巴要稍微张开，舌头放松。

除了上述基本的发音，还有一些常用的词组和搭配需要注意：

1. under the table，意思是“在桌子下面”，也可以指“在秘密地进行交易、聊天等活动”。例句：He hid his phone under the table so his boss wouldn't see him texting.

2. under the weather，意思是“身体不舒服、有点儿生病”。例句：I'm feeling a bit under the weather today, so I think I'll stay home and rest.

3. under control，意思是“得到控制、处于可控范围内”。例句：The fire is now under control, but the firefighters are still working to put it out completely.

4. under pressure，意思是“受到压力、处于压力之下”。例句：I always perform better under pressure, so I'm not too worried about the upcoming exam.

5. under consideration，意思是“正在考虑、正在审议中”。例句：Your proposal is currently under consideration, and we will let you know our decision as soon as possible.

总之，掌握under的正确发音和常用搭配，可以帮助我们更好地理解和运用这个词汇。