n.

someone who leads or initiates an activity (attack or campaign etc.)

the leading military unit in an attack

the head and sharpened point of a spear

同義詞：spearpointspear-point

Between Spearheads: Bricolage and Relationships
[WHO spearheads global initiative to eradicate hepatitis B]
`Arrowpoints, Spearheads and Knives of Prehistoric Times.'
'ARROWPOINTS, SPEARHEADS AND KNIVES OF PREHISTORIC TIMES.'.
UK spearheads efforts to combat rising threat of antibiotic resistance.
Digital video spearheads TV and videoconferencing applications
Spearheads for Reform: The Social Settlements and the Progressive Movement, 1890-1914
Church Spearheads Effort to Revive Neighborhood Agency Mapping Plans to Rehabilitate Housing
Spearheads of industrialisation or sweatshops in the sun?: A critical appraisal of labour conditions in Asian export processing zones
Quartz backed tools as arrowheads and hand-cast spearheads: Hunting experiments and macro-fracture analysis