Definition of crestfallen adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈkrestfɔːlən//
; NAmE NAmE//ˈkrestfɔːlən//
Unhappiness, Disappointment
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sad and disappointed because you have failed and you did not expect to Mrs Clark looked quite crestfallen all of a sudden. See related entries: Unhappiness, Disappointment Word Originlate 16th cent.: originally with reference to a mammal or bird having a fallen or drooping crest.
See the Oxford Advanced American Dictionary entry: crestfallen