English

Definition of thin verb from the Oxford Advanced Learner's Dictionary

     

    thin

     verb
    verb
    BrE BrE//θɪn//
     
    ; NAmE NAmE//θɪn//
     
    Verb Forms present simple I / you / we / they thin
    BrE BrE//θɪn//
     
    ; NAmE NAmE//θɪn//
     
    he / she / it thins
    BrE BrE//θɪnz//
     
    ; NAmE NAmE//θɪnz//
     
    past simple thinned
    BrE BrE//θɪnd//
     
    ; NAmE NAmE//θɪnd//
     
    past participle thinned
    BrE BrE//θɪnd//
     
    ; NAmE NAmE//θɪnd//
     
    -ing form thinning
    BrE BrE//ˈθɪnɪŋ//
     
    ; NAmE NAmE//ˈθɪnɪŋ//
     
     
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    liquid
  1. 1[transitive] thin something (down) (with something) to make a liquid less thick or strong by adding water or another substance Thin the paint with water.
  2. of hair
  3. 2[intransitive] to become less thick a middle-aged man with thinning hair
  4. become less thick
  5. 3[intransitive, transitive] to become less thick or fewer in number; to make something less thick or fewer, for example by removing some things or people The clouds thinned and the moon shone through. Global warming could be accelerated due to the thinning of the ozone layer. thin out The crowd had thinned out and only a few people were left. thin something (out) Thin out the seedlings to about 10cm apart.
  6. Word Origin Old English thynne, of Germanic origin; related to Dutch dun and German dünn, from an Indo-European root shared by Latin tenuis.Extra examples Gradually the crowd thinned to a narrow trickle. His hair was long at the sides but thinning on top. If the soup is too thick, thin it down with a little milk. The traffic was beginning to thin out. Thin the paint with white spirit.
See the Oxford Advanced American Dictionary entry: thin