best man
US /ˌbest ˈmæn/
UK /ˌbest ˈmæn/

1.
Trauzeuge
a male friend or relative who attends the bridegroom at a wedding, and is usually his chief attendant
:
•
My brother asked me to be his best man at his wedding.
Mein Bruder bat mich, sein Trauzeuge bei seiner Hochzeit zu sein.
•
The best man gave a funny speech at the reception.
Der Trauzeuge hielt eine lustige Rede beim Empfang.