lead off

Short definition from Wiktionary

Noun

1. 1
   The first batter in the batting order.
2. 2
   The first batter of an inning.
3. 3
   The short distance that a player stands away from their current base.
4. 4
   The first item in a broadcast schedule.
5. 5
   Alternative spelling of lead off.

Verb

1. 1
   Used other than figuratively or idiomatically: see lead, off.
2. 2
   To be the first batter of an inning.
3. 3
   To be the first of any set, especially the first person in a group to speak; to launch or begin something by speaking.

Adjective

1. 1
   Alternative spelling of leadoff.