talk big


Brag, boast, as in I don't believe he's ever shot even a duck, but he sure talks big about hunting. This colloquial idiom was first recorded in 1699.

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