Meaning of keep sth down In English

• 0 to be able to eat or drink something without vomiting:

  • On the day after her operation she couldn't keep anything down.

• 1 to control the size or number of something and prevent it from increasing:

  • We need to work hard to keep our prices down.

  • I'm going to sleep, so will you try to keep the noise down?

• 2 to control the size or number of something and prevent it from increasing:

  • To have any chance against the competition, we need to keep our prices down.