Opposite word for "lift" or "lift up"

Hi
I would say 'let down' or 'lower'

Just yesterday I asked a friend to help me lift a heavy box down from the shelf. I didn't even notice that it was the opposite of 'lift/lift up'.

Snappythings that are slung

Slung? If you're thinking of something more violent than "set down" or "put down", you can say "throw down".

lift up - set (back) down is my preferred pair. Then there's get down - put (back) up.

Let's lift up this box and then set it down over there.
Let's get this box down from the shel

wow... thanks allot i couldn't think about 'lower' preciate it thanks

As a verb - Lower. To lower.
Source: I have been English for 27 years and have lifted many objects of only to lower them shortly after.

Throw down