noun
patch; mending patch
A piece of cloth used to mend a tear or hole in clothing or fabric.
祖母は古い着物に継ぎ切れを当てて直した。
My grandmother mended the old kimono by applying a patch.
このズボンの継ぎ切れが目立たないように縫ってください。
Please sew this patch on the trousers so it isn't noticeable.
継ぎ refers to the act of mending or the mended part in general, while 継ぎ切れ specifically means the piece of cloth used as a patch.
パッチ is a loanword often used for decorative or iron-on patches, whereas 継ぎ切れ is a traditional term for a fabric patch used in mending.
Compound of 継ぎ (tsugi, 'mending, patching') and 切れ (kire, 'piece of cloth').