Utter an impudent, sarcastic, or ironic remark, as in She's constantly making cracks about the store's management. The noun crack here alludes to a hunter's shot at game. [Slang; late 1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.