/ ˌdiː aɪ ˈwaɪ; NAmE / noun
[ U ] ( BrE ) the activity of making, repairing or decorating things in the home yourself, instead of paying sb to do it (abbreviation for 'do-it-yourself') :
a DIY store
For more information see the Cultural Guide
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WORD ORIGIN
1950s: abbreviation of do it yourself .