If you say that something or someone is oversold, you mean that people say they are better or more useful than they really are.
例句
The couple idea is certainly oversold. There's so much pressure to become a couple that people feel failure if they don't conform...结婚的观念无疑被过分渲染了。人们面临来自各方的结婚压力，不结婚对他们来说就是一种失败。I think the reformers have at times oversold the reforms.我认为改革者有时过分吹嘘了改革的好处。