To commit oneself to a task or activity that is employment-related or that requires serious effort or concentration.
To be the first batter of an inning.
To be the first of any set, especially the first person in a group to speak; to launch or begin something by speaking.
Used other than figuratively or idiomatically: see lead, off.
The first batter in the batting order.
The first batter of an inning.
The short distance that a player stands away from their current base.