1. 控制;约束
To rein in something means to control it.
911查询·英语单词
2. 拉紧(马的)缰绳;勒缰(使马停步)
If you rein in a horse, you stop it or cause it to go more slowly by pulling its reins.
1. 七彩网.英语单词
1. stop or check by or as if by a pull at the reins
e.g. He reined in his horses in front of the post office
Synonym: rein
2. stop or slow up one's horse or oneself by or as if by pulling the reins
e.g. They reined in in front of the post office
Synonym: rein
3. control and direct with or as if by reins
e.g. rein a horse
2. rein in的解释