On/under oath
phrase
Required by law to tell the truth, especially while formally promising to do so before giving evidence in a court of law.
He testified under oath that he had seen the defendant commit the crime.
Often appears as...
- sworn under oath
- testify under oath
Usage tips
Formal
phrase
Being earnestly and deeply serious about something, as if under an oath or promise.
She promised on oath to keep the secret.
Often appears as...
- promised on oath
- spoke on oath
phrase
Required by law to tell the truth, especially while formally promising to do so before giving evidence in a court of law.
He testified under oath that he had seen the defendant commit the crime.
Often appears as...
- sworn under oath
- testify under oath
Usage tips
Formal
phrase
Being earnestly and deeply serious about something, as if under an oath or promise.
She promised on oath to keep the secret.
Often appears as...
- promised on oath
- spoke on oath
Definition 1 of 2
Pro Tip 1/3Legal Consequences
When you're under oath, lying can lead to charges of perjury, which is a serious crime.
If you're caught lying under oath, you might be prosecuted for perjury.
Pro Tip 2/3Courtroom Formality
'Under oath' often happens in a formal setting, like a court, where a legal oath is administered.
Witnesses in a trial are usually placed under oath before they testify.
Pro Tip 3/3Public Trust
Being under oath signifies that your statements carry the weight of honesty expected by society.
Jurors rely on testimony given under oath to make fair decisions.
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