To remove syntactic sugar from code, or more generally, to remove pleasant-seeming elements to expose something in its simplest form.
From de- + sugar + -ize (causative suffix). A back-formation creating a verb form from the noun phrase 'syntactic sugar' used in computer science.
Desugarize is the verb form that programmers use when they want to say 'let's make this code less pretty but more honest about what's really happening underneath.'
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