If someone looks crestfallen, their face and body show they are disappointed and a bit upset — as if the good feeling has dropped out of them. They might have just lost a game, been told no, or heard news they did not want. It is not a word for deep grief; it is the look of “oh… I really hoped that would go better.” The picture behind it is an old one: after a fight, a horse that has lost hangs its head, so the crest — the top of its neck, where the mane stands up — falls down onto its chest.

If someone looks crestfallen如果有人看起來crestfallen their face and body show they are disappointed and a bit upset他們的表情和身體會顯出失望、有點難過 as if the good feeling has dropped out of them好像原本的好心情從他們身上掉出去了 They might have just lost a game他們可能剛輸掉一場比賽 been told no被拒絕 or heard news they did not want或聽到不想聽的消息 It is not a word for deep grief這不是用來講深沉悲傷的字 it is the look of “oh… I really hoped that would go better.”而是唉…我真的希望結果會更好那種表情 The picture behind it is an old one背後的畫面是一個古老的意象 after a fight打完一仗之後 a horse that has lost hangs its head輸了的馬會垂下頭 so the crest所以那個crest — the top of its neck, where the mane stands up —（脖子最上方、鬃毛豎起的地方） falls down onto its chest就垂到牠的胸口

People still use the word, mostly in stories and slightly careful speech. It is not slang, and it is a little more colourful than just sad or disappointed.

People still use the word大家還是會用這個字 mostly in stories and slightly careful speech多半用在故事和比較講究的口語裡 It is not slang它不是俚語 and it is a little more colourful than just sad or disappointed而且比單純說sad或disappointed生動一點

The natural shape is how someone looks or seems: he looked crestfallen. Saying I am crestfallen is possible, but a bit heavier and less common.

The natural shape is how someone looks or seems最自然的用法是搭配look或seem he looked crestfallen像he looked crestfallen Saying I am crestfallen is possible說I am crestfallen也可以 but a bit heavier and less common但語氣比較重、也比較少見