Put/add the finishing touch(es) to something Verb + object/complement
If you put/add the finishing touch(es) to something, you do the last detail(s) that make it complete.
William and Henry will add the finishing touches.
I'm putting the finishing touches to my thesis.
I can help you add the finishing touches to your assignment.
Linda is in her lab putting the finishing touch to her experiment.
To finish or complete something in a satisfactory way
To finish the last few minor details of a project, assignment or report so that the task is completely done
1. To help someone prepare to get into bed, especially kids
2. To finish something or some first preparatory steps
3. To stop discussing, considering, or focusing on something
To fulfill something.
The verb "put/add" should be conjugated according to its tense.