Did you know?

Click any word in a definition or example to find the entry for that word

turn in - definition and synonyms

What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.

Thesaurus diagram

The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.

phrasal verb
Word Forms
present tense
I/you/we/theyturn in
he/she/itturns in
present participleturning in
past tenseturned in
past participleturned in
  1. 1
    [transitive] to tell the police about someone, or to take them to the police, because they have committed a crime

    His own brother turned him in.

    turn yourself in:

    She turned herself in to local police.

  2. 2
    [transitive] turn in something to produce a particular amount or degree of something
  3. 3
    [intransitive/transitive] to point or be directed inwards, or to make something do this

    Turn your toes in, like this.

  4. 4
    mainly American to give something to the person who has officially asked for it or who is in charge
    turn in something to someone:

    Mitro turned in his resignation to the President.

  5. 5
    [intransitive] informal old-fashioned to go to bed at night
  6. 6
    [transitive] mainly American to return something to the person it belongs to, especially something that was lost or was lent to you
See also main entry: turn
  • Facebook
  • Twitter


a rainbow produced when water droplets in the air reflect light from the moon rather than the sun

BuzzWord Article

Open Dictionary

platform capitalism

a way of doing business that involves recruiting large numbers of people who work for themselves using the company's platform, as used by companies such as Uber, Deliveroo and the like

add a word


A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog
Macmillan learn live love play