finishing touch
US /ˈfɪn.ɪʃ.ɪŋ tʌtʃ/
UK /ˈfɪn.ɪʃ.ɪŋ tʌtʃ/
1.
a final detail or improvement that completes or perfects something
:
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Adding the small decorative vase was the perfect finishing touch to the room.
•
The artist added a few more brushstrokes as a finishing touch to the painting.