Select the most appropriate meaning of the given idiom.

Sum and substance

Essence

The most appropriate meaning of the idiom "sum and substance" is essence. It refers to the central or essential part of something. For example, you could say that the sum and substance of a contract is the agreement to sell a house.

The other options are not as appropriate. Difficulty refers to how hard something is to do. Deliberation refers to careful thought or discussion. Assessment refers to a judgment or evaluation.