A more thorough explanation:

Definition: An infrequent or one-time sale that does not carry an implied warranty of merchantability because the seller is not a merchant with respect to goods of that kind.

Example: John sells his old car to his neighbor, but he is not a car dealer and does not regularly sell cars. This is an isolated sale.

Explanation: Because John is not a car dealer, he is not considered a merchant with respect to cars. Therefore, this sale does not carry an implied warranty of merchantability, which means that John is not responsible for any defects in the car that may arise after the sale.