on/under oath
under oath
Fig. bound by an oath; having taken an oath. You must tell the truth because you are under oath. I was placed under oath before I could testify in the trial.
See also: oath
on/under ˈoath
(law) having made a formal promise to tell the truth in a court of law: Is she prepared to give evidence on oath? ♢ The judge reminded the witness that he was still under oath.under oath
Under a burden or responsibility to speak truthfully or perform an action faithfully.
See also: oath