spearhead

[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. 2014.
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World English Dictionary
spearhead (ˈspɪəˌhɛd)
 
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
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Example sentences
Emerging as the spearhead of global industrial progress is the fiber-optic
  technology called wavelength division multiplexing.
Better everyday policing should have accompanied the elite anti-drug spearhead.
The company recently hired a senior cable-television executive to spearhead the
  effort.
Our only interest should be to help supplement democracy in the area, not
  spearhead it.
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