Meaning of したしきなかにもれいぎあり in Japanese

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Definition of したしきなかにもれいぎあり

したしきなかにもれいぎあり(shitashikinakanimoreigiari) 【親しき仲にも礼儀あり ·親しき仲にも礼儀有り ·親しき中にも礼儀あり ·親しき中にも礼儀有り】

(exp) good manners even between friends; a hedge between keeps friendships
「親しき仲にも礼儀あり」という言葉を知らないのか？
Don't you know the saying "good manners even between friends?"