english
1
general::
Decorate, dress up, as in They were all decked out in their best clothes. [Mid-1700s]
American Heritage Idioms
2
general::
Phrase(s): 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.
McGrawhill's American Idioms And Phrasal Verbs