Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Old French
Origin: apalir, from palir 'to turn pale'

appal

 verb
     
ap‧pal British English , appall American English [transitive]
to make someone feel very shocked and upset:
The way we kill animals appals a lot of people.
The decision to execute the two men has appalled many politicians.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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