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Curbstone
A curb (American English), or kerb (British English; see spelling differences), is the edge where a raised sidewalk (pavement in British English) or road median/central reservation meets a street or other roadway.
Wikipedia
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Kerbstone (noun)
A paving stone that forms part of a kerb
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Curbstone (noun)
alternative spelling of kerbstone|from=US
Wiktionary
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Kerbstone (noun)
a long, narrow stone or concrete block, laid end to end with others to form a kerb.
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Curbstone (noun)
variant spelling of kerbstone
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Curbstone (noun)
unqualified; amateur
“curbstone commentators”
Oxford Dictionary