ph.
1. The father turned in his boy for killing the mother.
那个父亲检举儿子杀害母亲。
1. 交出：turn down 关小、调低、拒绝 | turn in 交出 | turn into 变成
2. 上床睡觉;交还,上交：take in 欺骗;领会,理解 | take part in 参加,参与 | turn in 上床睡觉;交还,上交
3. 拐入：turn down 向下折转 | turn in 拐入 | turn inside out 翻出
4. 转身进入;拐入;交出：turn down 关小,调低;拒绝 | turn in 转身进入;拐入;交出 | turn into 进入;使变成,使成为
1. 上床睡觉
When you turn in, you go to bed.
e.g. Would you like some tea before you turn in?
你睡前想喝杯茶吗？
2. 把（犯罪嫌疑人）交给警方;告发;检举;自首
If you turn someone in, you take them to the police or tell the police where they are because they are suspected of committing a crime. If you turn yourself in, you go to the police because you have been involved in a crime.
e.g. He has been given until noon today to turn himself in to authorities...
他被要求在今天中午前向当局投案自首。
e.g. There would be strong incentives to turn someone in...
向警方举报某人将获重赏。
3. 上交;提交;交付
When you turn in a completed piece of work, especially written work, you give it to the person who asked you to do it.
e.g. Now we wait for them to turn in their essays...
现在我们等着他们交上作文。
e.g. I want everybody to turn a report in.
我希望每个人都上交一份报告。
4. 交还;返还
If you turn something in, you return it to the place or person you borrowed it from.
e.g. I went back to the station-house to turn in my badge and gun...
我回到警局交还警徽和佩枪。
e.g. The official showed up to tell her to turn in her library books.
那名管理人员出面让她返还所借图书馆的书。
verb
1. prepare for sleep
e.g. I usually turn in at midnight
He goes to bed at the crack of dawn
Synonym: go to bedbedcrawl inkip downhit the hayhit the sacksack outgo to sleepretire
2. carry out (performances)
e.g. They turned in a splendid effort
They turned in top jobs for the second straight game
Synonym: put on
3. make an entrance by turning from a road
e.g. Turn in after you see the gate
4. to surrender someone or something to another
e.g. the guard delivered the criminal to the police
render up the prisoners
render the town to the enemy
fork over the money