finishing touch definition by American Heritage Dictionary
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A small change or addition that serves to complete something.
finishing touch - Phrases/Idioms
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]