Definition of appall in English:

appall

Syllabification: ap·pall
Pronunciation: /əˈpôl
 
/

verb (appalls, appalling, appalled)

[with object]

Origin

Middle English: from Old French apalir 'grow pale', from a- (from Latin ad 'to, at') + palir 'to pale'. The original sense was 'grow pale', later 'make pale', hence 'dismay, horrify' (late Middle English).

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