Formal:
* The rebels deposed the king and established a republic.
* The CEO was deposed after a series of financial scandals.
* The witness was deposed under oath, giving testimony about the events leading up to the crime.
Informal:
* My brother tried to depose me as the family game champion, but I beat him fair and square.
* She deposed her old phone for a brand new model.
* The new evidence deposed the original theory about the cause of the accident.
Note: "Depose" can have different meanings depending on the context. In the formal examples, it means "to remove from office" or "to give testimony under oath." In the informal examples, it can mean "to replace" or "to prove something wrong."