Because the opposite is DOWN.
The opposite of up is down. So, opposite of the opposite of up is up itself.
poo up
line up
The opposite to up is down.
In logo software, the command PU stands for Pen Up
The opposite of over might beundercontinuing
The opposite of up the stairs is down the stairs, as the opposite of upstairs is downstairs.
The opposite of "put down" is 'pick up'.
why shouldn't you act pu in school or class
The opposite of down is up.
The opposite of "dug up" would be "buried" or "covered."
Loosen up is the opposite of stiffen up.