out to lunch

lunch

[luhnch]
noun
1.
a light midday meal between breakfast and dinner; luncheon.
2.
any light meal or snack.
3.
a restaurant or lunchroom: Let's eat at the dairy lunch.
verb (used without object)
4.
to eat lunch: We lunched quite late today.
verb (used with object)
5.
to provide lunch for: They lunched us in regal fashion.
Idioms
6.
out to lunch, Slang. not paying attention or tending to business; negligent: You must have been out to lunch when you wrote that weird report.

Origin:
1585–95; short for luncheon

luncher, noun
lunchless, adjective
prelunch, adjective, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
lunch (lʌntʃ)
 
n
1.  a meal eaten during the middle of the day
2.  (Caribbean) (among older people) mid-afternoon tea
 
vb
3.  (intr) to eat lunch
4.  (tr) to provide or buy lunch for
 
[C16: probably short form of luncheon]
 
'luncher
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

lunch
modern sense of "mid-day repast" is 1829, shortened form of luncheon. The verb meaning "to take to lunch" is attested from 1823.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases

out to lunch

Not in touch with the real world, crazy; also, inattentive. For example, If he believes that story, he's really out to lunch, or Anne hasn't heard a word you saidshe's out to lunch. This expression transfers a temporary physical absence for the purpose of eating to a temporary or permanent mental absence. [Slang; mid-1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Synonyms
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