The amount of something that can fit inside a closet, or a large quantity of something stored away.
Combination of 'closet' and the suffix '-ful' (as much as can be held). Modern colloquial formation following standard English patterns for measurement words like 'handful' or 'roomful.'
The phrase 'has a closet full of skeletons' metaphorically means hiding shameful secrets—this linguistic connection between closets and hidden truths reveals why closets became symbols of concealment in everything from fashion to psychology.
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