A series of consecutive successes, a run of good luck, as in Our son-in-law has been on a winning streak with his investments. This expression comes from gambling. [Mid-1900s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.