1. (

• spearhead

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

2. (

• spearhead

) the leading military unit in an attack ;

3. (

• spearhead ,
• spearpoint ,
• spear-point

) the head and sharpened point of a spear ;

1. (

• spearhead

) be the leader of; "She spearheaded the effort to find a cure for the disease" ;