late in the day
Far advanced; also, too far advanced. For example, It's late in the day to change the kitchen layout, since we've already ordered the cabinets, or It's a bit late in the day for apologizing. [Late 1700s]
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.