Buzzing emissaries fill the ears Of listening crowds
with jealousies and fears. --Dryden.
Usage: A spy is one who enters an enemy's camp or territories
to learn the condition of the enemy; an emissary may
be a secret agent appointed not only to detect the
schemes of an opposing party, but to influence their
councils. A spy must be concealed, or he suffers
death; an emissary may in some cases be known as the
agent of an adversary without incurring similar
hazard.