verb (used without object)
to cross a street at a place other than a regular crossing or in a heedless manner, as diagonally or against a traffic light.

1915–20, Americanism; jay + walk

jaywalker, noun
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World English Dictionary
jaywalk (ˈdʒeɪˌwɔːk)
(intr) to cross or walk in a street recklessly or illegally
[C20: from jay (sense 2)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

by 1912 in Amer.Eng. (said in original citation to be a Kansas City term), from jay, perhaps with notion of boldness and impudence. Related: Jaywalk; jaywalker.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
One idea would be return to aggressive enforcement of the laws against
  jaywalking in the affected areas.
Jaywalking is also a major contributor to pedestrian fatalities.
Stop for pedestrian and jaywalking laws are emphasized.
Jaywalking, between signal controlled intersections.
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