DictionaryRoot: crest
English
crest
an animal’s crest
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adjective
crestfallen
KREST-faw-luhn/ˈkrestfɔːlən/
Sad and discouraged after a disappointment.
Etymology
A fallen crest supplies an image of lost spirit, but the animal behind it is uncertain. The source suggests horses may underlie the expression rather than a defeated cock with its crest lowered.