supposed to
Intended to; also, believed to, expected to. For example, This pill is supposed to relieve your pain, or You're supposed to be my partner. [Early 1300s]
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Required to, as in He is supposed to call home. [Mid-1800s]
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not supposed to. Not permitted to, as in You're not supposed to smoke in here.
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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.