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supplement

verb [T]
 
 
/ˈsʌp.lɪ.ment/

Definition

C2 to add something to something to make it larger or better: He supplements (= adds to) his income by working in a bar in the evening. Some vegetarians like to supplement their diets with iron tablets.Augmenting and supplementing
(Definition of supplement verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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