To be or look glum; to sulk or appear morose; to move about in a heavy or gloomy manner.
Possibly imitative in origin, related to 'glum' or dialectal variations. Some etymologists suggest connection to 'gloom' or Norse-influenced vocabulary. The term appeared in British dialect and informal speech by the 19th century.
The verb 'glump' captures an entire posture—not just feeling sad but embodying sadness physically, slouching and moving as if weighted down by melancholy.
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