1. What does it mean?
응원법 literally means cheering method. In K-pop it usually refers to planned shouts, names, or sung responses timed to a song. Artists or fan communities may share guides so the audience can join together.
Also written or said as eungwonbeop
2. The nuance
It differs from simply singing every lyric along. The pattern is specific to the song or event, and not knowing it does not make someone less of a fan.
3. Examples
“공연 전에 응원법 영상을 보고 타이밍을 익혔어.”
Before the show, I watched the fan-chant guide to learn the timing.
“응원법이 바뀌어서 새 안내를 확인했어.”
The fan chant changed, so I checked the new guide.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.