be past (someone's or something's) best

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be past (someone's or something's) best

To no longer be in an ideal state or condition. Many gymnasts are past their best when they are only teenagers. This computer is so slow that it's definitely past its best.
See also: past

be past your/its ˈbest

be no longer as strong, fresh, young, beautiful, etc. as before: What do you mean, somebody over 35 is past their best? That’s nonsense. OPPOSITE: in the prime of (your) life
See also: past