finishing touch
The last detail added or change made to something to make it complete. Let's not spend too much longer on this. Let's just put the finishing touch on it and get it ready for production. He's been putting the finishing touches on that painting for so long now, I'm starting to think he'll never be satisfied with it.
finishing touch(es)
a final adjustment of something; some effort or action that completes something. Norm is in his workshop putting the finishing touches on his latest project.
finishing touch
A small change or addition that serves to complete something. For example, The room still needed a few finishing touches, such as a flower arrangement. This expression is sometimes put as a finishing stroke. [c. 1700]
the finishing ˈtouch(es)
the final details that make something complete: We’ve been putting the finishing touches to the party decorations.