to hide yourself by not standing up straight Keep down! You mustn't let anyone see you.
to prevent a person, group, etc. from expressing themselves freely synonym oppress The people have been kept down for years by a brutal regime. You can’t keep Laura down—she’s so full of life.
- 1to make something stay at a low level; to avoid increasing something to keep down wages/prices/the cost of living Keep your voice down—I don't want anyone else to hear. Keep the noise down (= be quiet).
- 2to not bring something back through the mouth from the stomach; to not vomit She's had some water but she can't keep any food down.