πρεσβεύω presbeúō

Meaning

to be a senior, i.e. (by implication) act as a representative (figuratively, preacher)

In the King James Version: be an ambassador

Derivation: from the base of G4245 (πρεσβύτερος);

Where it is used

• 2 Corinthians 5:20 Therefore we are ambassadors for Christ, as though God were making His appeal through us. We implore you on behalf of Christ: Be reconciled to God.
• Ephesians 6:20 for which I am an ambassador in chains. Pray that I may proclaim it fearlessly, as I should.