Synonyms of 'darn'
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A patch is a piece of material which you use to cover a hole in something.
jackets with patches on the elbows
piece of fabric
piece of cloth
piece of material
piece sewn on
Thesaurus for darn from the Collins English Thesaurus
If you darn something knitted or made of cloth , you mend a hole in it by sewing stitches across the hole and then weaving stitches in and out of them.