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oath

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take an oath

to make an oath; to swear to something. You must take an oath that you will never tell anyone about this. When I was a witness in court, I had to take an oath that I would tell the truth.

See also: oath, take

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

take an oath

To agree to a pledge of truthfulness or faithful performance.

See also: oath, take

under oath

Under a burden or responsibility to speak truthfully or perform an action faithfully.

See also: oath