Definitions

1. verb

to become or cause to become pale or discolored

“The cut apple began to appale from being left out in the open.”

2. verb

to become or grow pale or discolored through fear or fright

“She appaled at the sight of the snake.”

3. verb

to lose or become discolored, as the color or brilliance of something

“The once beautiful painting appaled over time due to exposure to sunlight.”