The Los Angeles Lakers rolled over the Indiana Pacers in Wednesday's the opening round game of the NBA championship series.
Rolled over is a euphemism for bested. 
Rolled over means that the Lakers won, so it would be considered a euphemism for that particular actuality. I think the system may have had trouble with how my sentence was structured.
( z1 euphemize :ARG1 ( z2 roll :direction ( z3 over ) ) :ARG3 ( z4 best ) )