Resembling, containing, or characterized by curbs; having prominent curbs or curb-like qualities.
From 'curb' plus the diminutive/characteristic suffix '-y' (having the quality of), a highly productive English adjectival suffix.
The '-y' suffix is one of the most flexible in English—we can add it to almost any noun to create an adjective, so 'curby' streets instantly means 'streets with prominent curbs,' even though it's probably a rare word.
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