Definition of "redouble" []

• To double. (verb-transitive)
• To repeat. (verb-transitive)
• Games To double the doubling bid of (an opponent) in bridge. (verb-transitive)
• To become twice as great. (verb-intransitive)
• Games To double a double in bridge. (verb-intransitive)

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.

• "President Barack Obama, in his State of the Union address Tuesday, called on Congress to "redouble" efforts to rebuild roads, bridges and other infrastructure, even as it cuts elsewhere."
• "A month after taking charge in Afghanistan, Gen. David Petraeus on Wednesday issued an updated tactical directive governing the use of force by U.S. and NATO troops, urging them to "redouble" their efforts to protect Afghan civilians."
• "Senior U.S. officials said the Obama administration would "redouble" its efforts to get Israel to ease the blockade."