Definition of "spearhead" [spear•head]

• The sharpened head of a spear. (noun)
• The leading forces in a military thrust. (noun)
• The driving force in a given action, endeavor, or movement. (noun)
• To be the leader of (a movement, for example): "spearheaded the effort to offer classes in settlement houses [and] provide lecturers to women's clubs” ( Catherine Clinton). (verb-transitive)

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.

• "I thank you, Sir, and may I add this: In your reference to the spearhead, I couldn't help but think that the force behind the spearhead is Leo Dolan."
• "UNIDENTIFIED MALE: We've actually been called the spearhead of the surge."
• "HAIGHT: (INAUDIBLE) have been kind of called the spearhead of the surge."