be in the balance

Từ điển Oxford Advanced Learner 8th

(be/hang) in the ˈbalance idiom
if the future of sth/sb, or the result of sth is/hangs in the balance, it is uncertain
•The long-term future of the space programme hangs in the balance.
•Tom's life hung in the balance for two weeks as he lay in a coma.
Main entry: ↑balance_idiom