Definition of "blue-on-blue" []

• LakeSaimaa A lake of southeast Finland. It is the largest of the Saimaa Lakes, a group of more than 120 interconnected lakes in the south-central and southeast part of the country.

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Military investigations into friendly fire incidents have been criticised by a mother who lost her only son in Afghanistan in a "blue-on-blue" shooting."
• "But when there's a nutjob INSIDE your house, whatever will do the job without any blue-on-blue."
• "OUR VANCOUVER UNIFORMS were blue-on-blue, the arms and legs of the skin suits navy blue around a light-blue top, the top adorned with a small American flag, the USA on the back this time in red."