To do less well than expected. The measuring stick is the whole point: underperforming is never simply 'doing badly', it is doing worse than what people had a right to expect from you — from your past record, your ability, your price, or a target that was set.

To do less well than expected表現得比預期差 The measuring stick is the whole point重點就在那個比較的標準 underperforming is never simply 'doing badly'underperform從來不是單純'做得不好' it is doing worse than what people had a right to expect from you而是做得比別人有理由期待你做到的還差 from your past record, your ability, your price, or a target that was set這個期待可能來自你過去的紀錄、你的能力、你的價碼，或是設定好的目標

A shop can make a healthy profit and still underperform, if the plan said it would make twice as much.

A shop can make a healthy profit and still underperform一間店可以賺到不錯的利潤，卻還是算underperform if the plan said it would make twice as much如果原本計畫是要賺到那個的兩倍的話

The word grew up in business and finance and still lives there most comfortably: a business underperforms when it fails to earn the profit it forecast, and a share or a fund underperforms when it grows more slowly than the market or the other funds it is compared with. In that financial sense it is often used with a direct object — 'the fund underperformed the index' — which is unusual and worth noticing, because everywhere else the verb stands alone.

The word grew up in business and finance and still lives there most comfortably這個字是在商業和金融圈長大的，也還是在那裡用得最自在 a business underperforms when it fails to earn the profit it forecast一間公司沒有賺到它預估的利潤，就叫underperform and a share or a fund underperforms when it grows more slowly than the market or the other funds it is compared with一支股票或基金成長得比大盤或拿來比較的其他基金慢，也叫underperform In that financial sense it is often used with a direct object在這個金融的用法裡，它常常會直接接受詞 'the fund underperformed the index'像'the fund underperformed the index'（這支基金的表現落後大盤指數） which is unusual and worth noticing這點很特別，值得注意 because everywhere else the verb stands alone因為在其他用法裡，這個動詞都是單獨用，不接受詞

It has spread well beyond money: an underperforming school, an underperforming student, a team that underperformed all season, an engine that underperforms in cold weather. In offices it has become a soft, official word for someone whose work is not good enough — 'we need to talk about your performance' — and precisely because it sounds neutral and technical, it can land harder than a plain complaint.

It has spread well beyond money這個字早就用到金錢以外的地方了 an underperforming school, an underperforming student像an underperforming school（表現不佳的學校）、an underperforming student（表現不佳的學生） a team that underperformed all seasona team that underperformed all season（整季表現不如預期的球隊） an engine that underperforms in cold weatheran engine that underperforms in cold weather（在低溫下表現不佳的引擎） In offices it has become a soft, official word for someone whose work is not good enough在職場裡，它變成一種委婉、正式的說法，用來說某人的工作表現不夠好 'we need to talk about your performance'像'we need to talk about your performance'（我們得談談你的表現） and precisely because it sounds neutral and technical而正因為它聽起來中性又專業 it can land harder than a plain complaint反而比直接抱怨更傷人

Forms: underperform, underperformed, underperforming; the noun is 'underperformance'.

Forms: underperform, underperformed, underperforming詞形變化：underperform、underperformed、underperforming the noun is 'underperformance'名詞是'underperformance'