Definition of swatch noun from the Oxford Advanced Learner's Dictionary

 

swatch

 noun
noun
BrE BrE//swɒtʃ//
 
; NAmE NAmE//swɑːtʃ//
 
 
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a small piece of cloth used to show people what a larger piece would look or feel like Word Origin early 16th cent. (originally Scots and northern English, denoting the counterfoil of a tally, and later a tally fixed to a piece of cloth before dyeing): of unknown origin.
See the Oxford Advanced American Dictionary entry: swatch