Failing to stand out among others, as in In that huge economics class Jane's afraid she'll get lost in the shuffle. This metaphoric term alludes to mixing playing cards before dealing them. [c. 1900]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.