Cooked, but not cooked enough. The heat did not go far enough in, so the middle is still soft, wet, or in the case of meat still red and cool. You use it about food that came out of a kitchen wrong: underdone chicken, underdone potatoes, an underdone cake that sinks in the middle. It is the natural opposite of 'overdone'.

Cooked有煮，but not cooked enough但沒煮到夠熟。The heat did not go far enough in熱度沒有透進去，so the middle is still soft, wet所以中間還是軟軟濕濕的，or in the case of meat still red and cool如果是肉的話中間還是紅紅冷冷的。You use it about food that came out of a kitchen wrong用來形容廚房做壞的食物：underdone chicken沒熟的雞肉、underdone potatoes沒熟的馬鈴薯、an underdone cake that sinks in the middle中間會塌下去的沒熟蛋糕。It is the natural opposite of 'overdone'它剛好是'overdone'的反義詞。

There is one important thing to notice about how people really say it. Nobody uses 'underdone' as praise.

There is one important thing to notice有一件重要的事要注意，about how people really say it就是大家實際上怎麼用這個字。Nobody uses 'underdone'沒有人會用'underdone' as praise來稱讚。

If a person likes their steak red, they ask for it 'rare' — that is a choice, and it sounds good. 'Underdone' means the cook made a mistake, and it is what you say when you send the plate back. So the same red steak is 'rare' when you wanted it and 'underdone' when you did not.

If a person likes their steak red如果有人喜歡牛排帶血紅色，they ask for it 'rare'他們會要求'rare'——that is a choice那是一種選擇，and it sounds good而且聽起來很不錯。'Underdone' means the cook made a mistake'underdone'表示廚師做錯了，and it is what you say when you send the plate back是你要把盤子退回去時會說的話。So the same red steak所以同一塊帶血的牛排，is 'rare' when you wanted it你想要的時候是'rare'，and 'underdone' when you did not你不想要的時候就是'underdone'。

Outside food, you sometimes hear it about work that was not developed enough — 'the ending of the film felt underdone' — meaning it needed more time and care. That use is not common in everyday speech, but it is easy to understand when you meet it.

Outside food食物以外，you sometimes hear it about work that was not developed enough有時會聽到用它形容還沒發展完整的作品——'the ending of the film felt underdone'像'the ending of the film felt underdone'——meaning it needed more time and care意思是還需要多花時間和心力。That use is not common in everyday speech這種用法在日常口語裡不常見，but it is easy to understand when you meet it但遇到的時候不難理解。