Closing the final gap between being almost at something and completely at it. Going the last 10 percent. Could be the end of a big project, getting someone's number,
sealing the deal on a date. Anything in which the last step might be the most difficult.
From
Will Smith's explanation about first kisses in the movie
Hitch.
"
So what's happening with you and
Wes?" "Nothing much lately, but I think tonight I'm going 10."