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whitening

noun [U]
 
 
/ˈwaɪ.tən.ɪŋ/ US  /-t̬ən-/ (also whitener)

Definition

a substance that you put on sports shoes to make them whiter and cleanerShoes and shoemaking
(Definition of whitening noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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