To remove junk or unwanted items from something; to clean up or eliminate useless material.
From 'de-' (to remove) + 'junker' (a worthless or broken-down vehicle) + '-ize' (to make or become). This is a modern word combining informal vocabulary with standard suffixation.
This word perfectly captures the American habit of creating new verbs by adding '-ize' to any word—it's like we turn English into Play-Doh, stretching and reshaping words to mean whatever we need them to mean.
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