turn in

phrasal verb

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turn in

to face the centre or move towards the centre in a curve朝内；向内拐
- Her feet turn in.她的两脚呈内八字。
(old-fashioned) to go to bed上床睡觉
- It’s late—I think I’ll turn in.不早了，我该睡觉去了。

turn somebody in

(informal) to take somebody to the police or somebody in authority because they have committed a crime把…扭送（到警察局）；使自首
- She threatened to turn him in to the police.她扬言要把他交给警方。
- He decided to turn himself in.他决定到警察局去自首。

turn something in

to give back something that you no longer need交还，退还（不再需要的东西）
- You must turn in your pass when you leave the building.你离开大楼时必须交还通行证。
(especially North American English) to give something to somebody in authority上交；呈交；提交
- They turned in a petition with 80 000 signatures.他们递交了一份有 8 万人签名的请愿书。
- I haven't even turned in Monday's work yet.我连星期一的作业还没交呢。
to achieve a score, performance, profit, etc.取得（分数）；完成（表演）；获得（利润）
- The champion turned in a superb performance to retain her title.上届冠军表现十分出色，卫冕成功。