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Hangdog describes a look on someone's face: sorry, ashamed, a bit beaten, as if they know they have done wrong. We usually say a hangdog expression or a hangdog look — the head a little down, the eyes not meeting yours. You might see it on a child who broke a cup, or on an adult who has been caught in a lie. The word is a little old-fashioned and a little literary, but people still use it because the picture is so clear. Though actually, it is not about hanging a dog. It is hang + dog: the image is a dog with its head hanging, guilty and sad.
慚愧、可憐巴巴的表情（垂著頭、一副做錯事的樣子）
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
hangdognoun
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A base, degraded person.
hangdogadj
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Low; sneaking; ashamed.
- The poor colonel went out of the room with a hangdog look.
- Asper Argo, the Well-Beloved, Commdor of the Korellian Republic greeted his wife’s entry by a hangdog lowering of his scanty eyebrows. To her at least, his self-adopted epithet did not apply. Even he knew that.
hangdogverb
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To move or loiter in a sneaking or ashamed manner.
- With a twenty-one to three victory, Pinewood high-stepped it off the field while our Falcons hangdogged their way to the locker room.
- Just a few stragglers left hangdogging around, latchkey types with no place to be, cutting up in the dim and bleachered gym perimeter.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。