emissary noun

/ˈem.ɪ.sər.i/

/-ser-/ n [C] formal

Definition

a person sent by one government or political leader to another to take messages or to take part in discussions

The Foreign Secretary has flown to China as the personal emissary of the Prime Minister.

(Definition of emissary noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Synonyms and related words:

If a problem preys on your mind, you think about it and worry about it a lot

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