That would be to leave someone hanging.

那将是让某人悬而未决。

" To leave (someone) hanging" means to say or do something that makes other people want to have more information, want to know what will happen next.

“让（某人）悬着” 的意思是说或做某事让其他人想要了解更多信息， 想知道接下来会发生什么。

" To leave (leave) someone hanging" means not to let someone know the final decision about something, to make someone wait to find out something important that that person wants to know.

“to leave (leave) someone hanging” 的意思是不让某人知道某事的最终决定， 让某人等待发现那个人想知道的重要事情。