noun
a person who looks guilty or ashamed
adjective
having a guilty or shamefaced expression
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The employee approached his boss with a hangdog expression, ready to accept responsibility for the mistake.
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After losing the game, the player walked off the field with a hangdog look on his face.
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I could tell by his hangdog demeanor that he had messed up again.
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The politician's hangdog attitude did not inspire confidence in his ability to lead.