holdout

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One that withholds agreement or consent upon which progress is contingent.
• noun An act of holding out, especially in refusing to reach an agreement.

from the GNU version of the Collaborative International Dictionary of English.

• noun a negotiator who hopes to gain concessions by refusing to come to terms after most other participants have signed an agreement.
• noun a refusal by a negotiator to come to terms in the hope of obtaining a better deal.
• noun the act of hiding playing cards in a gambling game so they are available for personal use later.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One who refuses to give consent to an agreement in the hope of an improved offer; one who holds out.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the act of hiding playing cards in a gambling game so they are available for personal use later
• noun a negotiator who hopes to gain concessions by refusing to come to terms
• noun a refusal by a negotiator to come to terms in the hope of obtaining a better deal
• verb wait uncompromisingly for something desirable
• verb continue to live through hardship or adversity
• verb thrust or extend out
• verb last and be usable
• verb stand up or offer resistance to somebody or something