Plural of bucket + full; an alternate plural form of bucketful meaning multiple amounts equal to bucket capacity.
Formed by pluralizing 'bucket' before adding 'full,' an older plural form that treats 'bucket' and 'full' as separate elements (compare 'spoonfuls' vs. 'spoonsful').
Language historians find plural formation fascinating because 'bucketsful' treats the noun as central (plural buckets) while 'bucketfuls' treats the measurement as the unit—both are logical in different ways!
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