truth serum

noun

: a hypnotic or anesthetic held to induce a subject under questioning to talk freely

Examples of truth serum in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
In a league too often sanitized by coachspeak, facial expressions might be our last great truth serum. Zak Keefer, New York Times, 27 Apr. 2026 More celebrity beauty news: Now, watch the Forbidden Fruits cast sip truth serum: Follow Allure on Instagram and TikTok, or subscribe to our newsletter to stay up to date on all things beauty. Marci Robin, Allure, 14 Apr. 2026 Curiously, leaving office seems to act as a kind of truth serum for GOP politicians. Letters To The Editor, The Orlando Sentinel, 15 Jan. 2026 The playfulness kicks in when George and Kathryn invite the other suspects over for a dinner spiced with garlic and truth serum. Amy Nicholson, Los Angeles Times, 13 Mar. 2025 See All Example Sentences for truth serum

Word History

First Known Use

1900, in the meaning defined above

Time Traveler
The first known use of truth serum was in 1900

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Cite this Entry

“Truth serum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/truth%20serum. Accessed 2 May. 2026.

Medical Definition

truth serum

noun
: a hypnotic or anesthetic (as thiopental) held to induce a subject under questioning to talk freely
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