buller

Reading level: hard

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Etymology

From Scots buller (“to boil, seethe”). Of obscure origin. Probably related to Old Norse bulla (“to boil”) and Old French bullir (“to boil”), Latin bulliō (“to boil”), all from Proto-Indo-European *bew- (“swelling”).

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