pigeonhole - definition and synonyms

verb [transitive] showing disapproval 

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/ˈpɪdʒ(ə)nˌhəʊl/
present tense
I/you/we/theypigeonhole
he/she/itpigeonholes
present participlepigeonholing
past tensepigeonholed
past participlepigeonholed
  1. to decide that someone or something belongs to a particular type or group, especially without knowing much about them