keep down
1．remain at a lower level 处于低水平
Most of the food shops have promised to keep prices down until after the new year．大多数食品店答应新年之后才涨价。
2．not vomit；retain in the stomach 不呕吐；留在胃里
Jane is sick again today；she hasn't been able to keep her food down．简今天又生病了，吃下的东西都吐了出来。
3．control 控制；抑制
I could hardly keep my temper down when I saw the boys treating my dog badly．当我看见那些男孩待我的狗不好时，简直按捺不住愤怒。
The children could not keep their voices down．孩子们不能控制他们的声音。
You should try to keep down your anger．你应该尽量克制自己的脾气。
The firemen kept the fire down with hoses．消防队员用水龙管压住了火势。
4．keep with limits；limit 限制
She is managing to keep down her daily expenses so she could save more money．她设法紧缩日常开支，以便能积攒更多的钱。
We should keep down the soaring prices．我们应控制物价的飞涨。
We should take measures to keep down nonproductive expenses．我们应采取措施削减非生产性开支。
5．keep from progressing or growing；prevent from increasing 阻止…前进、生长、增多
We hoe the garden to keep down the weeds．我们锄花园里的地以免杂草丛生。
He has found out a new way to keep down weeds in paddy fields．他们找到了一种控制稻田杂草的新方法。
Chemicals are used for keeping insects down．用化学药品灭虫。
6．oppress 镇压
The police were ordered to keep down the riot．警察奉命镇压暴动。
The government intends to keep down the revolutionaries．政府企图镇压革命者。
The peasants were kept down initially but finally they staged an uprising．农民们起初被压服了，但最后还是举行了起义。