"You're so right" (4)
(Other definitions for amen that I've seen before include "Last word of prayer" , "prayer's ending" , "Response to prayer" , "as agreed!" , "Final word in prayer" .)
(Other definitions for true that I've seen before include "Exact, factual" , "A false alternative?" , "Rightly so called" , "Straight or loyal" , "Consistent with fact" .)