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 Synonyms
3. lead, start, initiate, pioneer.