To overvalue something is to believe, or to say, that it is worth more or matters more than it really does. You can overvalue a gift because of who gave it, overvalue a brand, overvalue your own work. It is a judgement about worth and importance, not only about guessing a number.

To overvalue somethingovervalue某樣東西 is to believe, or to say就是相信、或說出 that it is worth more or matters more than it really does它比實際上更值錢、或更重要. You can overvalue a gift你可以overvalue一份禮物 because of who gave it因為送禮的人是誰而, overvalue a brand也可以overvalue一個品牌, overvalue your own work或overvalue自己的作品. It is a judgement about worth and importance這是對價值和重要性的一種判斷, not only about guessing a number不只是猜一個數字.

The opposite idea is undervalue. The usual noun for the act is overvaluation, not overvalue, though you may meet overvalue as a noun in money writing.

The opposite idea is相反的概念是 undervalueundervalue低估. The usual noun for the act is這個動作常用的名詞是 overvaluationovervaluation（高估）, not overvalue不是overvalue, though you may meet overvalue as a noun不過你也可能看到overvalue當名詞用 in money writing在財經寫作裡.

Though actually, people mix it with overestimate. Overestimate is often about a number or a size you guessed too high. Overvalue has more of the heart in it — you have given the thing too much weight.

Though actually不過其實, people mix it with人們常常把它跟 overestimateoverestimate高估混在一起. Overestimate is often about a number or a sizeoverestimate通常是講一個數字、或一個大小 you guessed too high你猜得太高了. Overvalue has more of the heart in itovervalue則多了一份心意在裡面 — you have given the thing too much weight——是你給了這樣東西太多的重量.