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1. To dress in an especially extravagant manner. A noun or pronoun can be used between "deck" and "out." Wow, you sure got decked out for the party tonight! Maybe I should have worn something nicer than jeans.
2. To decorate something lavishly or elaborately. A noun or pronoun can be used between "deck" and "out." Wow, you really decked out the house for the party tonight—I've never seen so many Christmas lights in my life!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
deck someone or something out (in something)and deck someone or something out (with something)
to decorate someone or something with something. Sally decked all her children out for the holiday party. She decked out her children in Halloween costumes. Tom decked the room out with garlands of flowers.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Decorate, dress up, as in They were all decked out in their best clothes. [Mid-1700s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.