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verb thin pronunciation in British English /θɪn/ 
Word Forms
present tense
present participlethinning
past tensethinned
past participlethinned
  1. 1



    thin down

    [transitive] to make something smaller in number, amount, or size

    Sales have decreased and we've decided to thin our workforce.

    Police thinned down the crowd.

    1. a.
      [intransitive] to become smaller in number, amount, or size
      Synonyms and related words for this sense of thin
  2. 2



    thin out

    [transitive] to remove plants, leaves, trees etc so that they do not fill an area or space completely
    Synonyms and related words for this sense of thin
  3. 3
    [intransitive] if someone's hair thins, they gradually lose the hair from their head

    a man with grey thinning hair

    Synonyms and related words for this sense of thin


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