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hallmark

verb [T]
 
 
/ˈhɔːl.mɑːk/ US  /ˈhɑːl.mɑːrk/

Definition

to put an official mark on an object made of gold or silverMetals and metalworkingChemical elements
(Definition of hallmark verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of hallmark