TRY TO DO OR GET somethingto behave too confidently because you think you are in a stronger position than you actually are 高估自己的力量,不自量力
The unions overplayed their hand in the end and failed to get the pay rise they wanted.
最终工会高估了自己的力量,未能实现他们希望的加薪。
Examples from the Corpus
overplay your hand• By opposing even a moderateban on assaultweapons, the gunlobby has overplayed its hand.• Eventually, however, Safdarjung overplayed his hand.• Should she spell it out to him, or would that fatally overplay her hand?• This drove a much harder bargain and, it has been suggested, represents the moment at which Edward overplayed his hand.• The unions overplayed their hand in the end.• If his opponents were intent on overplaying their hand, it could only improve his position with the cardinal.