0 the addition of a product or service with different features, sizes, prices, etc., to an existing range of products:
The company's lack of product line extension has lost it market share.
Both Lysol and Palmolive plan product line extensions.
Product-line stretching not only provides customers with more choice, it strengthens the company against competitive attacks.
1 a product that is added to an existing range of similar products:
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.