Definitions

lie detector

NOUN

machine for gauging truth

Synonyms

WEAK

polygraph polygraph machine psychogalvanic skin response psychogalvanometer

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Rhino poaching almost doubled in South Africa's Kruger National Park in 2025 compared to the previous year, despite interventions including dehorning and lie detector tests for rangers, the government said Tuesday.

From Barron's • Feb. 10, 2026

All three balls were authenticated by SCP Auctions through notarized affidavits and lie detector tests.

From Los Angeles Times • Nov. 22, 2025

But she also recently revealed in a Vanity Fair lie detector test that she failed a few exams along the way, blaming ChatGPT for being an unreliable study buddy.

From Salon • Nov. 6, 2025

She said a Combs aide administered a lie detector test to her.

From Los Angeles Times • May 28, 2025

“I’m sorry, I couldn’t hear you. My lie detector was going off. Try again: Are you running away from home?”

From "Pax" by Sara Pennypacker