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Contraction of should not.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


contraction of
should not
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈʃʊd nt)
contraction of should not.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


(ʃud) negative short form shouldn't (ˈʃudnt) verb
1. past tense of shall . I thought I should never see you again.
2. used to state that something ought to happen, be done etc. You should hold your knife in your right hand; You shouldn't have said that.
3. used to state that something is likely to happen etc. If you leave now, you should arrive there by six o'clock.
4. used after certain expressions of sorrow, surprise etc. I'm surprised you should think that.
5. used after if to state a condition. If anything should happen to me, I want you to remember everything I have told you today.
6. (with I or we) used to state that a person wishes something was possible. I should love to go to France (if only I had enough money).
7. used to refer to an event etc which is rather surprising. I was just about to get on the bus when who should come along but John, the very person I was going to visit.
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.
References in classic literature ?
I was naturally a little shy at pushing my nephew, but I'm happy to say you've done me credit, sir; and if I'd had a son o' my own, I shouldn't have been sorry to see him like you."
"Why shouldn't I laugh?" he asked, pinning her with his elbows, and advancing his face to hers.
You shouldn't have gone into my room in the first place and you shouldn't have touched a brooch that didn't belong to you in the second.
`Yes, but some crumbs must have got in as well,' the Hatter grumbled: `you shouldn't have put it in with the bread-knife.'
Harrison, "and you shouldn't have laid the scene among rich city people.
"Why shouldn't she take me seriously?" he demanded sharply.
"No--I suppose we shouldn't. Of course we have the others."
I shouldn't have come in at all except to see how you were getting on."
THE STORY GIRL, WITH A PRETERNATURALLY SOLEMN FACE:--"You shouldn't criticize Peter's story like that.
And no matter who they are, it's somebody they shouldn't be.
"The sun shouldn't strike it at all but it does in the morning."
Anyhow, I shouldn't like you to do it, for it 'ud be too hard work for you."