from The American Heritage® Dictionary of the English Language, 4th 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A traffic calming measure, consisting of a transverse ridge in the road, to limit the speed of vehicles.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a hindrance to speeding created by a crosswise ridge in the surface of a roadway
Sorry, no etymologies found.
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.