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Webster 1913 Edition

Adj.

Having the lower chap or jaw drooping, – an indication of humiliation and dejection; crestfallen; discouraged. See

chapfallen ‎(comparative more chapfallen, superlative most chapfallen)

crestfallen, dejected
- Washington Irving
  […] he certainly sallied forth, after no very great interval, with an air quite desolate and chapfallen […]