A more thorough explanation:

Definition: To call upon as a witness, to ask earnestly, or to protest.

Examples:

• During the trial, the lawyer obtested the witness to tell the truth.
• The villagers obtested the king to provide them with food and water during the drought.
• The students obtested the school administration to change the dress code policy.

The examples illustrate the different meanings of the word "obtest." In the first example, the lawyer is calling upon the witness to testify in court. In the second example, the villagers are earnestly asking the king for help during a difficult time. In the third example, the students are protesting against the school's dress code policy.