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Phrase(s): get the wrinkles out (of something)
1. Lit. to remove the wrinkles from fabric by ironing or flattening in some way. • This has been packed in my suitcase for a week, and I know I’ll never be able to get the wrinkles out of it. 2. Fig. to eliminate some initial, minor problems with an invention, a procedure, a computer program, or a mechanical device. • I need more time working with this system to get the wrinkles out.
McGrawhill's American Idioms And Phrasal Verbs