What does 'Hangdog expression' mean?

A hangdog expression is one where the person's showing their emotions very clearly, maybe a little too clearly for your liking. It's that mixture of misery and self-pity that is similar to a dog when it's trying to get something it wants but daren't take without permission.

All idioms have been editorially reviewed, and submitted idioms may have been edited for correctness and completeness.

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