yammer
To complain peevishly.
intransitive
To talk loudly and persistently.
intransitive
To repeat on and on, usually loudly or in complaint.
transitive
To make an outcry; to clamor.
intransitive, rare
It was a ship, but a whale to the Dark Nebula’s minnow; and on its side was the Spaceship-and-Sun of the Empire. Every alarm on the ship yammered hysterically.
Where it comes from
From Middle English ȝameren, ȝaumeren, yemeren, ȝomeren, from Old English ġeōmrian (“to lament”), from Proto-West Germanic *jāmarōn, from Proto-Germanic *jēmarōną (“to show misery or sadness”), from Proto-Germanic *jēmaraz (“miserable, sorrowful, sad”), from Proto-Indo-European *yem- (“to hold, match, defeat”). Reinforced by cognate Middle Dutch jammeren (modern Dutch jammeren), from the same ultimate origin. Cognate also with Scots yammer, Saterland Frisian jammerje, West Frisian jammerje, German Low German jammern, German jammern, Danish jamre, Norwegian jamre. Compare also Old Norse amra (“to howl, wail, yammer”).
Adapted from the Wiktionary entry yammer (CC BY-SA 4.0).