Noah Webster
Appall
APPALL', verb transitive [Latin palleo, to become pale. See Pale.]
1. To depress or discourage with fear; to impress with fear, in such a manner that the mind shrinks, or loses its firmness; as, the sight appalled the stoutest heart.
2. To reduce, allay or destroy; as, to appall thirst. [Unusual.]
APPALL', verb intransitive To grow faint; to be dismayed.