A more thorough explanation:

Definition: Ordinary skill refers to the level of expertise or knowledge that a person skilled in a particular field or art possesses. It is the level of skill that an average person in that field or art would have.

For example, if we are talking about a carpenter, ordinary skill would refer to the level of expertise that an average carpenter would have. This would include knowledge of basic carpentry techniques, tools, and materials.

Another example would be in the field of music. Ordinary skill for a musician would refer to the level of proficiency that an average musician would have in playing their instrument or singing. This would include knowledge of basic music theory, technique, and performance skills.

These examples illustrate how ordinary skill is the level of expertise that is considered normal or average for a particular field or art. It is important to understand this concept when evaluating the work of someone in a particular field or art, as it helps to determine whether their work is of a high quality or not.