What is the meaning of Intervene?

To become involved in a situation, so as to alter or prevent an action. [with in]

To occur, fall, or come between, points of time, or events.

To occur or act as an obstacle or delay.

To say (something) in the middle of a conversation or discussion between other people, or to respond to a situation involving other people.

To come between, or to be between, persons or things.

In a suit to which one has not been made a party, to put forward a defense of one's interest in the subject matter.

Source: wiktionary.org