keep something down
phrasal verb with keep verb uk/kiːp/ us/kiːp/ kept | kept
(FOOD)
吃（或喝）下东西（而不吐）
to be able to eat or drink something without vomiting
On the day after her operation she couldn't keep anything down. 手术的第二天，她吃什么都吐。
(SIZE)
B2 压缩；控制，限制…的规模
to control the size or number of something and prevent it from increasing
We need to work hard to keep our prices down. 我们必须努力控制我们产品的价格。
I'm going to sleep, so will you try to keep the noise down? 我要睡觉了，你能不能不要太吵？