finish
Think of finish like the last piece of a puzzle. When you put that piece in, the picture is complete, and you can see the whole image. Just like when you finish eating your ice cream, the cone is empty and you know that treat is over.
Imagine a race where everyone is running to the end. The finish line is where the race stops. When you cross it, you know you have done your best and the race is complete.
Picture a bedtime story. The finish is like the last page of the book. When you turn that page, the story is over, and you can think about what happened.
Think about a painting. The finish is when you put the last color on the canvas. When you step back, you see a beautiful picture that is all done.
In your day, when you brush your teeth before bed, that is the finish of your day. It means you are ready to sleep and rest for a new day tomorrow. Finish is when something is all done and you can start something new or just rest.