stuck for, be
Be unable to obtain or think of, as in We're stuck for a fourth for bridge, or In this course I'm always stuck for an answer. [Colloquial; first half of 1900s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.