Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Origin: yomer 'to talk quietly, be sad' (12-15 centuries), from Old English geomrian

yammer

 verb
     
yam‧mer also yammer on [intransitive]
informal to talk continuously in a way that is annoying:
a crowd of yammering aunts and cousins
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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