The spelling is upside down, which is hyphenated upside-down when used as an adjective.
It is not hyphenated.
They sweat and when they sweat they cool down because when the sweat evaporates you cool down.
sweat is a mechanism to cool the body down. the body creates sweat, so it can cool itself down.
Motorcycle is not hyphenated
No it's not hyphenated.
words are only hyphenated when they have a separate meaning when separated than they do when hyphenated
it means either calm down or relax or if your sweating like cool down
No, "hardworking" is not hyphenated.
Yes it should be hyphenated.
It can be. Some words can be seen both hyphenated and non-hyphenated.
No. Mint does not cool down water. It only creates the senation of something being cool.