reduce
/ri-ˈdüs/
verb
to draw together or cause to converge : consolidate
to diminish in size, amount, extent, or number
to decrease the volume and concentrate the flavor of by boiling
reduce all the questions to one
idiom
to cause (someone) to become suddenly silent
The crowd was reduced to silence.
idiom
to cause (someone) to cry
The movie's ending reduced them to tears.