finishing touch
noun/ˌfɪnɪʃɪŋ ˈtʌtʃ/
/ˌfɪnɪʃɪŋ ˈtʌtʃ/
[usually plural]- a final detail or action that completes a piece of work and makes it even better
- He put the finishing touches to his painting.
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finishing touch