To make a choice or decision: opted for early retirement; opted not to go.
Opt out Slang To choose not to participate in something: "give individual schools the right to opt out of the local educational authority” ( Newsweek).
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.