Definition

To complain or grumble persistently and often tediously; to whine or talk complainingly. The term suggests repetitive, annoying complaining rather than a single outburst.

Example Usage

He spent the entire meeting yammering about the budget cuts instead of proposing solutions.

Origin

From Middle Low German 'jammer' (misery), related to Old High German 'jammerōn' (to bewail).

Fun Fact

Yammer is often used colloquially in American English, while British English might prefer 'moan' or 'grouse' for similar meaning.

Source: Definition backfill (hailey)