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1. (Railways) dialect (in the US) a white cross-shaped road sign used at railway crossings
2. (Crafts) a strengthening bar attached to the planks of a door
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈkrɔsˌbʌk, ˈkrɒs-)

an X-shaped warning sign for vehicular traffic at a railroad grade crossing.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
* Look for the crossbuck sign, lights or gates at crossings.
3 Delta/McKenzie's latest answer to affordable 3-D is the new CrossBuck 3D Target made especially for the fastest compounds or crossbow use.
Currently, reflective white strips are used in Michigan for additional marking on railroad crossbuck supports (both front and back).
The railroad crossbuck, devised in an era when trains were the usual mode of long-distance land travel for both people and goods, is the oldest road sign.
The old halfback crossbuck works well against a defense that is keying the fullback in the option series, particularly a high school defense with a middle LB.
RAILROAD CROSSBUCK sign - shall be white and words RAILROAD CROSSING in black letters.
stop signs, crossbuck signs), a train's whistle is the only audible warning of its approach.
The new CrossBuck 3-D Target; from Delta Targets is designed to stop high-speed crossbow bolts, and no longer will shooters have to pull with all their might to retrieve a bolt from an ordinary target.