蚀 
= 
in the seal script, it consists of three parts, 虫 worm or insect, 食 food utensil, and 人. The character in seal script depicts a worm eats into a man’s food.
In the clerical script, 
is changed to 
and the person 
is removed.
In simplified character, 飠is changed to 饣.
The original meaning of is extended to: corrode, erode, lose, eclipse