straighten
verb uk/ˈstreɪ.tən/ us/ˈstreɪ.ən/
(NOT CURVING)
[ I or T ]（使）变直，（使）挺直，弄直
to become straight or to make something become straight
He straightened his tie. 他把领带拉正。
Her hair is naturally curly but she always straightens it. 她的头发是自然卷，但她老是把它拉直。
The road straightens out after a few miles. 公路过了几英里后就直了。
(LEVEL)
[ T ]使变平直；把…弄正
to make something level
The picture fell while I was trying to straighten it. 我想把画的位置调正，结果它掉下来了。
(TIDY)
[ T ]整理;收拾整齐
to make something tidy
She stood up and straightened her clothes. 她站起来，把衣服整理了一下。
Pepe was careful to straighten his room before leaving. 佩佩很细心，走之前把房间收拾得整整齐齐。
Phrasal verbs
straighten someone out 使（某人）改邪归正，使（某人）端正行为
to improve someone's behaviour
I thought that once he got a girlfriend that would straighten him out. 我认为他一旦有了女朋友就会迷途知返的。
straighten something out 解决（问题）；成功应付（困境）
to solve a problem or to deal successfully with a confusing situation
Once we get these problems straightened out, we should be all right. 我们一旦把这些问题解决掉，就会没事儿的。
整理好;把…清理干净;把…收拾整齐
to make something tidy or organized
Could you straighten out these cupboards, please? 你能把碗橱收拾妥当吗？
straighten up 挺直身体，直起身
to stand straight after bending at the waist
US改邪归正，改过自新
to behave well after behaving badly
You'd better straighten up or else! 你最好改邪归正，否则有你好看的！
straighten something up 整理好;清理干净;把…收拾整齐
to make a place tidy
Mark and I managed to straighten up the house before our parents got home. 马克和我赶在爸爸妈妈回家之前收拾好了屋子。