The Collaborative International Dictionary of English v.0.48:
Chopfallen \Chop`fall`en\, a. Having the lower chop or jaw depressed; hence, crestfallen; dejected; dispirited; downcast. See Chapfallen. [1913 Webster]WordNet (r) 3.0 (2006):
chopfallen adj 1: brought low in spirit; "left us fatigued and deflated spiritually" [syn: chapfallen, chopfallen, crestfallen, deflated]