weigh a ton
To be extremely heavy. Most often refers to something that must (and can feasibly) be handled by hand, as opposed to something that actually weighs a ton or more. Greg, go get your brother to help us lift this thing. It weighs a ton!
weigh (half) a ˈton
(informal) be very heavy: These suitcases weigh a ton! What have you got in them? OPPOSITE: (as) light as air/a feather