Definitions from Wiktionary (appall)

▸ verb:  (transitive) To fill with horror and/or indignation; to dismay.
▸ verb:  (transitive, obsolete) To make pale; to blanch.
▸ verb:  (transitive, obsolete) To weaken; to reduce in strength
▸ verb:  (intransitive, obsolete) To grow faint; to become weak; to become dismayed or discouraged.
▸ verb:  (intransitive, obsolete) To lose flavour or become stale.

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