confined to one's home, a hospital, etc., as from illness.
Psychiatry. disposed to desire solitude; withdrawn; asocial.
(of an oil or gas well) temporarily sealed up.
a person confined by infirmity or disease to the house, a hospital, etc.
Also called shut-in well. an oil or gas well that has been closed down.

1840–50, Americanism; adj., noun use of verb phrase shut in Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  chiefly (US), (Canadian)
 a.  a person confined indoors by illness
 b.  (as modifier): a shut-in patient
2.  psychiatry See also schizoid a condition in which the person is highly withdrawn and unable to express his own feelings

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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American Heritage
Medical Dictionary

shut-in n.
A person confined indoors by illness or disability. adj.

  1. Confined to a home or hospital, as by illness.

  2. Disposed to avoid social contact; excessively withdrawn or introverted.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The surface and subsurface safety systems functioned properly to shut-in the structure.
Cyclic process with the well alternately flowing and shut-in.
Report only the maximum pressure and corresponding temperature recorded during the shut-in period.
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