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

1.
兩頭落空, 兩邊不討好
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.
新政策試圖取悅所有人,但最終兩頭落空,誰也沒能滿意。
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If you try to specialize in too many areas, you might fall between two stools and not excel in any.
如果你試圖在太多領域專業化,你可能會兩頭落空,在任何一個領域都無法出類拔萃。