Meaning of がっち in Japanese

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Definition of がっち

がっち(gacchi) 【合致】

(n, vs) agreement; concurrence; conformance; compliance
彼の日々の振る舞いは彼の主義主張と合致していない。
His daily behavior is not consistent with his principles.

がっちり(gacchiri)

がっちりや(gacchiriya) 【がっちり屋】

がっちょ(gaccho) · ごうちょ(goucho) 【合著】

You and I must stick close, back to back.