used to say that somebody is/would be happier or more satisfied because they are/if they were in a particular position or doing a particular thing（在某情况下或因做某事）更幸福，更满意
She's better off without him.没有他，她活得更幸福。
The weather was so bad we'd have been better off staying at home.天气非常恶劣，我们还不如待在家里舒服。