Stroke Of Business Meaning

(idiomatic, archaic) (of business or trade) a large or considerable amount

Example: 1898, Charles Spurgeon, The Autobiography of Charles H. Spurgeon: 1834-1854
  "How my father came to hear of this little stroke of business I never knew, but some little bird or other whistled it to him, and he was very soon down upon me in right earnest."