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appall

or ap·pal

[uh-pawl]
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verb (used with object)
  1. to fill or overcome with horror, consternation, or fear; dismay: He was appalled by the damage from the fire. I am appalled at your mistakes.
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Origin of appall

1275–1325; Middle English < Middle French ap(p)allir to grow or make pale, equivalent to a- a-5 + pal(l)ir in same sense; see pale1

Synonyms

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horrify, daunt. See frighten.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for appall

v.

also appal, early 14c., "to fade;" c.1400, "to grow pale," from Old French apalir "become or make pale," from a- "to" (see ad-) + palir "grow pale," from Latin pallere (see pallor). Meaning "cause dismay or shock," is 1530s. Related: Appalled; appalling.

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Online Etymology Dictionary, © 2010 Douglas Harper