Open English Wordnet

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

(n)spearheadthe leading military unit in an attack

(n)spearhead, spearpoint, spear-pointthe head and sharpened point of a spear

(v)spearheadbe the leader of“She spearheaded the effort to find a cure for the disease”

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