fall between two stools
US /fɔl bɪˈtwin tu stulz/
UK /fɔl bɪˈtwin tu stulz/

1.
两头落空, 两边不讨好
fail to be part of either of two categories, plans, or courses of action, but instead be in an awkward intermediate position
:
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The new policy tried to please everyone but ended up falling between two stools, satisfying no one.
新政策试图取悦所有人,但最终两头落空,谁也没能满意。
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If you try to specialize in too many areas, you might fall between two stools and not excel in any.
如果你试图在太多领域专业化,你可能会两头落空,在任何一个领域都无法出类拔萃。