1
general::
Phrase(s): give the lie to something
Fig. to show that something is a lie. • The evidence gives the lie to your testimony. • Your own admission of your part in the conspiracy gives the lie to your earlier testimony.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Show to be false, refute, as in His black eye gave the lie to his contention that he hadn't been fighting. [First half of 1500s]
American Heritage Idioms