A more thorough explanation:

Sound is an adjective that describes something that is good, healthy, and free from disease or disorder. It can also describe something that is marketable or exercised equitably under the circumstances.

Sound can also be used as a verb to mean that something is actionable or recoverable in a legal context.

• After a thorough check-up, the doctor declared that the patient was sound and healthy.
• The real estate agent assured us that the property was sound and would be a good investment.
• The judge ruled that the defendant's actions were sound and exercised with discretion.
• The plaintiff's claims for physical injury sound in tort, not in contract.
• The victim's tort action sounds in damages, not in equitable relief.

These examples illustrate how the term sound can be used to describe different aspects of health, property, and legal matters. In each case, the term emphasizes the idea of something being good, healthy, or recoverable.