To bring (something) into practice.
To cause (someone) to be acquainted (with someone else).
To add (something) to a system, a mixture, or a container.
To make (something or someone) known by formal announcement or recommendation.
To drive or campaign ardently for, as an effort, project, etc.
The leading military unit in an attack.
One who leads or initiates an activity (such as an attack or a campaign).
The pointed head, or end, of a spear.
A player who initiates attacking moves.