Plural of cupful, meaning multiple cups filled with a substance, each holding the amount that a cup can contain.
From the English word 'cup' combined with 'ful' (Old English 'full'), creating the noun 'cupful' meaning the amount one cup holds, pluralized with '-s'.
The plural of 'cupful' can be written two ways—'cupsful' or 'cupfuls'—and linguists have debated which is correct for centuries, even though both are now considered acceptable.
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