Synonyms of 'pleat'
large baggy trousers, pleated at the front
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Creases are lines that are made in cloth or paper when it is crushed or folded.
She frowned at the creases in her silk dress.
If cloth or paper creases or if you crease it, lines form in it when it is crushed or folded.
Most outfits crease a bit when you're travelling.
Liz sat down carefully, so as not to crease her skirt.
Thesaurus for pleat from the Collins English Thesaurus
A pleat in a piece of clothing is a permanent fold that is made in the cloth by folding one part over the other and sewing across the top end of the fold.