keep something down

Từ điển Oxford Advanced Learner 8th

ˌkeep sthˈdown derived
1. to make sth stay at a low level; to avoid increasing sth
•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).
2. to not bring sth back through the mouth from the stomach; to not ↑vomit
•She's had some water but she can't keep any food down.
Main entry: ↑keep_derived