1. lead an organised activity or effort
Professional
Social
spearhead the campaign/attack/drive
To 'spearhead' something is to lead a group in an attack or in a strategic movement or to direct a group of people in some way. You could 'spearhead' an organisation by being responsible for major decisions or 'spearhead' a political movement by beginning it or leading others. This verb can be used in social and professional contexts.