noun, noun or participle which takes 'suru', intransitive verb
batting first; going first (in a game)
Primarily used in baseball to refer to the team that bats first. Can also be used in other sports or games to mean the side that goes first.
先攻はホームチームです。
The home team bats first.
じゃんけんで勝った方が先
The winner of rock-paper-scissors can choose to go first.