1. lie detector: an electrical device that registers involuntary physical processes such as pulse rate and perspiration and that is often used as a lie detector
2. test using polygraph: a test using a polygraph, or a result of this test
transitive verb (past and past participlepol·y·graphed, present participlepol·y·graph·ing, 3rd person present singularpol·y·graphs)
Definition:
give somebody polygraph test: to test somebody, usually somebody suspected of committing a crime, using a polygraph
