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challenge

noun [C] (INSTRUCTION)
 
 
/ˈtʃæl.ɪndʒ/

Definition

an instruction given by a soldier or guard at a border or gate, telling someone to stand still and say their name and reasons for being thereThe armed forces generally
(Definition of challenge noun (INSTRUCTION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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