From Longman Dictionary of Contemporary Englishlie detectorˈlie deˌtector noun [countable] TLIE/TELL A LIEa piece of equipment used especially by the police to check whether someone is lying, by measuring sudden changes in their heart rate SYN polygraph He was asked to take a lie detector test.
Examples from the Corpus
lie detector• For his own information, Boesen asked Hicks to take a lie detector test.• Wagenbach rejected a bid by Elliott to introduce as evidence an offer made to Mrs Moon to take a lie detector test.• Too little; far, far, far too much, straight to a lie detector.• Kids have a built-in lie detector.• Why, he asked, did the only lie detector test given indicate deception?lie detector test• For his own information, Boesen asked Hicks to take a lie detector test.• Wagenbach rejected a bid by Elliott to introduce as evidence an offer made to Mrs Moon to take a lie detector test.• Why, he asked, did the only lie detector test given indicate deception? 