There is an existing field called website_description which you can add to the form view for your product template. The website_description field is an html field and populates the area below the product image (left-aligned) and product info (right-aligned), so is essentially coded into the "body" of a product's page on the shop.

Alternatively, if you don't want the description_sale on the website, or want a new description in its place, you would need to modify the website_sale.product view and remove or replace description_sale field with the desired field; the desired field could also potentially be a new field if you create one via a custom module or studio.

See snippet.