It refers to a revolt, rebellion or showing the opposite, but originally it referred to meigen, that is, the action of exorcising an evil spirit, devils and impurities by making a sound pulling a bow string.
反抗や謀反（むほん）や楯突くことであるが、本来は鳴弦のことで弓の弦を引いて鳴らす事により悪霊や魔や穢れを祓う行為。