1. phrasal verb
When you turn in, you go to bed. [informal] [V P] ⇒ Would you like some tea before you turn in?
2. phrasal verb 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. [V n P + to] ⇒ He has been given until noon today to turn himself in to the authorities. [V n P] ⇒ There would be strong incentives to turn someone in. [V n P] ⇒ He seems to be making all the arrangements necessary so that he can continue trafficking in drugs when he turns himself in. [V P n] ⇒ I might today hesitate to turn in a burglar. 3. phrasal verb When you turn in a completed piece of work, especially written work, you give it to the person who asked you to do it. [V P n] ⇒ Now we wait for them to turn in their essays. [V n P] ⇒ I want everybody to turn a report in. 4. phrasal verb → turn If you turn something in, you return it to the place or person you borrowed it from. [mainly US] [V P n] ⇒ I went back to the station-house to turn in my badge and gun. [V P n (not pron)] ⇒ The official showed up to tell her to turn in her library books. [Also V n P]
COBUILD Advanced English Dictionary. Copyright © Harper Collins Publishers