Definition of queer fish in English:

queer fish

phrase

British
informal
  • A person whose behaviour seems strange or unusual.

    ‘they have invariably chosen the queer fish in preference to the more or less recognizable member of the human race’
    • ‘The musical is a queer fish, but youth theatre thrives on such challenges.’
    eccentric, oddity, odd fellow, unorthodox person, character, individualist, individual, free spirit, misfit
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