Idioms and Phrases with square meal, a
square meal, a
A substantial or complete meal, as in These airlines never feed you; I haven't had a square meal on one yet. [Mid-1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.