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]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use supposed to in a sentence
He told him about the princess, but made no mention of the supposed-to-be-hidden money.The Bradys After a Chinese Princess | Francis Worcester Doughty