noun
Muso Jikiden Eishin-ryu (iaido style)
A specific school of iaido (the art of drawing the sword). The name is a proper noun referring to this tradition.
See also: 居合道
彼は無双直伝英信流の達人だ。
He is a master of Muso Jikiden Eishin-ryu.
居合道 is the general art of iaido, while 無双直伝英信流 is a specific school within that art.
The name is composed of 無双 (peerless), 直伝 (direct transmission), 英信 (Eishin, a person's name), and 流 (school/style). It refers to the iaido school tracing its lineage to Hasegawa Eishin.