to spare

In addition to what is needed, extra, left over, as in We paid our bills and still had money to spare. This expression uses spare in the sense of “leftover” or “unused,” a usage dating from the late 1500s.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.