polygraph
word
Definition
A polygraph is a machine that measures and records physical responses, like heart rate and sweating, used to try to tell if someone is telling the truth.
Usage & Nuances
'Polygraph' is mostly used in law enforcement and legal contexts. It's also called a 'lie detector,' but results aren't always accepted as evidence in court. 'Take a polygraph test' is a common phrase.
Example Sentences
Many people call a polygraph a lie detector, but it isn't always reliable.
natural
The police used a polygraph during the investigation.
basic
He agreed to take a polygraph test.
basic
A polygraph measures changes in your body.
basic
He failed the polygraph, but insisted he was telling the truth.
natural
Sometimes, just knowing they'll face a polygraph makes suspects nervous enough to confess.
natural