State under oath refers to a legal term where an individual swears to tell the truth in a court of law. There are several synonyms for this phrase, including take an oath, swear an oath, take the stand, testify under oath, and give evidence. These phrases are often used interchangeably in legal settings to describe the act of giving testimony under penalty of perjury. It is important to remember that when an individual takes an oath and gives testimony, they are bound by the law to tell the truth. Failure to do so can result in legal consequences and in some cases can lead to jail time.