#1 run down v. trace; "We are running down a few tips". wn
#2 run down v. move downward; "The water ran down". wn
#3 run down v. injure or kill by running over, as with a vehicle. wn
#4 run down v. use up all one's strength and energy and stop working; "At the end of the march, I pooped out". wn
#5 run down v. examine hastily; "She scanned the newspaper headlines while waiting for the taxi". wn
vizzz