Intercede (verb)

1. To intervene on behalf of another, especially by pleading with someone in authority.
2. To act as a mediator in order to resolve a conflict or dispute.

Origin:

From latin intercedere, from inter- ("between") + cedere ("to g.o")

Examples:

1. The lawyer interceded on behalf of his client during the trial.
2. The mediator interceded in the dispute between the two companies.
3. The ambassador interceded with the government on behalf of the refugees.
4. The mother interceded with the teacher to get her son a break.
5. The teacher interceded on behalf of the student to get her a chance to explain herself.