Chol (pronounced "coal") is a Hebrew word that is mentioned in the Bible. It means regular or everyday things, like bread, water, and clothing. In the Bible, there are several special days, like holy days and festivals, where people would eat special foods and wear special clothes. But on every other day, they would eat chol food and wear regular clothes.
So, to put it simply, chol just means everyday things that people use and consume regularly. It's the opposite of special or sacred things.