American Heritage® Dictionary of the English Language, Fourth Edition
- n. An artificial ridge set crosswise into the surface of a street, parking lot, or driveway to make the operators of vehicles decrease speed.
- n. A traffic calming measure, consisting of a transverse ridge in the road, to limit the speed of vehicles.
- n. a hindrance to speeding created by a crosswise ridge in the surface of a roadway
“On Punctuation Highway, the writer-as-speaker is a dasher, only half-braking at every stop sign; the writer-as-writer measures every pause, uses a comma for the speed bump and a semicolon to proceed with caution at the balancing of closely related complete thoughts, as in this sentence.”
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