The amount that can fit in a can, or multiple cans filled to capacity.
From 'can' (a metal container, from Old English 'canne') plus the suffix '-ful' (meaning 'the amount that fills'), combining to mean 'the quantity one can holds.'
The word 'cansful' shows how English lets us stack suffixes creatively—we could say 'three cansful' or 'spoonsful' or 'handsful,' but many people now prefer 'three cans full' because it sounds more natural, showing how language preferences shift over generations.
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