n.
Something, especially an inducement or concession, used as leverage in negotiations: "A bargaining chip is ultimately worthless if you're not willing to bargain it away" (New Republic).
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.