noun
supporting attack; assist
Primarily a military term for a secondary attack that supports the main effort. Also used in sports (especially soccer) for an assist leading to a goal.
歩兵部隊が主力の突入を助攻した。
The infantry unit carried out a supporting attack for the main assault.
彼は今シーズン、10回の助攻を記録している。
He has recorded 10 assists this season.