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lie detector

noun
🔊/ˈlaɪ dɪtektə(r)/
🔊/ˈlaɪ dɪtektər/
(also specialist polygraph)
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  1. a piece of equipment that is used to find out if somebody is telling the truth测谎器Topics Crime and punishmentc1
    Oxford Collocations DictionaryLie detector is used before these nouns:
    • test
    See full entry