(verb)
to enthusiastically praise or publicize something/someone, or to greet it with excitement;
e.g. The released a statement to herald the new invention.
(noun)
a person whose official function is to carry messages, convey news, and make announcements, especially an official in a government who acts as an ambassador of their leader;
e.g. The herald announced to the people that the nation was no longer at war.
(noun)
something that precedes an event and thus acts as a sign, i.e. something that foreshadows;
e.g. The bird's singing was a herald of approaching morning.