Webster's English Dictionary

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appall

Cross references:
  1. dismay                
 
ap.pall also ap.pal \*-'po.l\ vb also ap.palled;  or ap.pall.ing [ME 
   appallen, fr. MF apalir, fr. OF, fr. a- (fr. L ad-)] + palir to grow pale, 
   fr. L pallescere, incho. of palle-re to be pale obs  : WEAKEN, FAIL  : to 
   overcome with fear or dread