verb
(intransitive) To complain peevishly.
(intransitive) To talk loudly and persistently.
(transitive) To repeat on and on, usually loudly or in complaint.
(intransitive, rare) To make an outcry; to clamor.
(intransitive) to repeatedly call someone's name.
noun
The act or noise of yammering.
A loud noise.
One who yammers.