white label

Short definition from Wiktionary

Adjective

1. 1
   Being a generically manufactured product, rebranded with the marketer's or retailer's trade dress: synonym of private label.
2. 2
   Unbranded; being a brand name product which has had a white label applied to remove branding so that it can be resold for cheaper without undercutting the value of the brand.
3. 3
   Being a vinyl record with a white label or white background (rather than artwork), typically used for test records or promotion.
4. 4
   Describing a non-branded product manufactured by one company and sold by another, especially by a supermarket as a basic or economic alternative to a branded product.

Verb

1. 1
   To sell (another manufacturer's product) in this manner.