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]
Examples from the Web for finishing touch
When man attempts to add a finishing-touch to the loveliness of the forest, lake, or ocean, he makes a botch of it.
These combinations put the finishing-touch on the strength of his wife's position.It Never Can Happen Again|William De Morgan
To put a finishing-touch to it, though the lady walked with modestly downcast eyes there was a sly and merry smile on her face.The Possessed|Fyodor Dostoevsky
The rubbing of a bit of lemon about the beaker's brim is the finishing-touch to a whiskey punch.Cobwebs From an Empty Skull|Ambrose Bierce (AKA: Dod Grile)
The defensive fortification was the finishing-touch to the original structure.Bramble-bees and Others|J. Henri Fabre