be neither fish nor fowl
US /bi niːðər fɪʃ nɔr faʊl/
UK /bi niːðər fɪʃ nɔr faʊl/
1.
不伦不类, 难以归类
to be difficult to categorize or identify; to not belong to any particular group or type
:
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His new business venture seems to be neither fish nor fowl; it's not quite a restaurant, but not just a cafe either.
他的新商业项目似乎不伦不类；它不完全是餐馆，但也不仅仅是咖啡馆。
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The new policy is so vague that it seems to be neither fish nor fowl, making it hard to implement.
这项新政策如此模糊，以至于它似乎不伦不类，难以实施。