spear·head

[speer-hed]
noun
1.
the sharp-pointed head that forms the piercing end of a spear.
2.
any person, contingent, or force that leads an attack, undertaking, etc.
verb (used with object)
3.
to act as a spearhead for: She spearheaded the drive for new members.

Origin:
1350–1400; Middle English; see spear1, head


3. lead, start, initiate, pioneer.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
spearhead (ˈspɪəˌhɛd) [Click for IPA pronunciation guide]
 
n
1.  the pointed head of a spear
2.  the leading force in a military attack
3.  any person or thing that leads or initiates an attack, a campaign, etc
 
vb
4.  (tr) to lead or initiate (an attack, a campaign, etc)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Spearhead is one of our favorite verbs.
So is yaff. Does it mean:
to bark; yelp.
to introduce subtleties into or argue subtly about.
Example sentences
Our only interest should be to help supplement democracy in the area, not
  spearhead it.
Emerging as the spearhead of global industrial progress is the fiber-optic
  technology called wavelength division multiplexing.
The pike shall be surmounted by a spearhead and the length of the pike shall be
  nine feet, not including the spearhead.
The company recently hired a senior cable-television executive to spearhead the
  effort.
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