be neither fish nor fowl
US /bi niːðər fɪʃ nɔr faʊl/
UK /bi niːðər fɪʃ nɔr faʊl/

1.
bukan ikan maupun unggas, sulit dikategorikan
to be difficult to categorize or identify; to not belong to any particular group or type
:
•
His new business venture seems to be neither fish nor fowl; it's not quite a restaurant, but not just a cafe either.
Usaha bisnis barunya tampaknya bukan ikan maupun unggas; itu bukan restoran sepenuhnya, tapi juga bukan hanya kafe.
•
The new policy is so vague that it seems to be neither fish nor fowl, making it hard to implement.
Kebijakan baru itu sangat samar sehingga tampaknya bukan ikan maupun unggas, membuatnya sulit diterapkan.