Definition of "tossup" [tossup]

• Informal An even chance or choice: It is a tossup whether we will win or lose. (noun)
• Informal The flipping of a coin to decide an issue. (noun)

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.

• "We didn't release today's poll with the others because we were focused on voter attitudes about clean energy in tossup House races where the incumbent voted for the House climate bill known as the American Clean Energy & Security Act (ACES)."
• "We have seen Senator Dodd move from what was called a tossup race -- that is, could go either way -- to a leans Republican race."
• "CNN now estimates if the election were held today, Obama would win 264 electoral votes, John McCain would win 174. 100 electoral votes remain in that so-called tossup column, 270 the magic number need to win the election."