Definition of truth serum in English:

truth serum

Syllabification: truth se·rum
(also truth drug)

noun

A drug supposedly able to induce a state in which a person answers questions truthfully.
More example sentences
  • I'm also going to administer the truth drug here as well, ‘he said touching the tube connected to the man's leg.’
  • If you took a truth drug, what would you be worried about divulging?
  • As he explained, it can refer to anything from the use of so-called truth drugs to application of one or another method of torture.

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