What does the base of dissaprove mean?

The base of "disapprove" is the verb "approve," which means to accept, agree with, or endorse something. When you add the prefix "dis-" to it, it negates the meaning, resulting in "disapprove," which signifies a lack of approval or agreement. Essentially, to disapprove is to express a negative judgment or rejection of a particular idea, action, or proposal.