[kraws-buhk, kros-]
an X -shaped warning symbol for vehicular traffic at a railroad grade crossing.

cross- + buck3 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The point at which train tracks cross a road is marked with a white crossbuck
Crossbuck signs have been put at many public railroad crossings.
If there is no white line painted on the pavement, you must stop the bus before
  the crossbuck sign.
Subpart four specifically addresses a driver's duty when arriving at a crossing
  marked only by a crossbuck.
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