Meaning of 海千山千(うみせんやません) in Japanese

Examples of 海千山千, うみせんやません in a sentence

• あいつも海千山千だから、相手と取引させてもかなり手づよいぞ。

  With all of his tricks he has mastered, he will be able to deal with any formidable client.

• あいつは海千山千だから、取り引き相手としてはかなり手強いぞ。

  All those tricks he's got up his sleeve make him a formidable client.