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English definition of “hallmark”

hallmark

noun [C] uk   /ˈhɔːl.mɑːk/ us    /ˈhɑːl.mɑːrk/

hallmark noun [C] (MARK)

in the UK, an official mark put on objects made of gold or silver that shows their place and year of origin and how pure the metal is that is used to make them

hallmark noun [C] (CHARACTERISTIC)

a typical characteristic or feature of a person or thing: Simplicity is a hallmark of this design. This explosion bears/has all the hallmarks of (= is extremely likely to have been) a terrorist attack.

hallmark

verb [T] uk   /ˈhɔːl.mɑːk/ us    /ˈhɑːl.mɑːrk/
to put an official mark on an object made of gold or silver
(Definition of hallmark from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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