capper
Theme: CONCLUSION
n. the climax or clincher of something.The capper of the evening was when the hostess got lathered before midnight and couldn't celebrate the New Year.When the butler tripped and served Mr. Wilson the entire dessert in his lap, that was the capper to an exciting evening.
capper
noun
1
a clincher; something that beats all others UK, 1960.
2
in a drug-selling enterprise, a person who fills capsules with a drug US, 1958.
3
in a confidence swindle, a person who lures the victim into the swindle. From the verb CAP US, 1753.
4
in an auction, a dummy bidder US, 1853