British spelling of driveling; present participle of drivel.
British variant maintaining the doubled 'l' from the stem 'drivel'. The 'e' is kept in British English before '-ing' when doubling the consonant.
British English kept the 'drivelling' spelling because they double the 'l' in 'drivel' before any suffix—it's a rule that applies consistently across dozens of words like 'travelling', 'labelling', and 'compelling'.
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