Sentence:  When he turned into the highway that led to the outskirts of the city and then rose toward home , he had to pull over to the <WSD>curb</WSD> and wait for a few minutes , sucking in air and squinting and blinking his eyes to clear them of tears . 
Meaning of the word marked with <WSD> tags:  an edge between a sidewalk and a roadway consisting of a line of curbstones (usually forming part of a gutter)