a sale made under the agreed condition that most of the goods being sold are as good as one that has been shown to the buyer as a sample
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sale by sample UK US noun [C or U] (plural sales by sample)
► COMMERCE, LAW a sale in which the buyer sees one of the products being sold, and buys a number of them on the condition that they are of the same quality as that one: »
Usually a sale by sample is implied when a sample is shown and both parties intend that the goods should be of the same kind and quality as the sample is.
Financial and business terms. 2012.