Happy Hump Day everyone, time for another riddle!

 

Sometimes you will use it,

to cause a decrease.

Sometimes you will take it,

and anemia will cease.

Sometimes you will swing it,

and a lie’s undone.

Fe, Fi, Fo, Fum –

Look at the first one.

 

Same drill as before, post your guess in the comment section below, and once the correct answer is posted I will confirm!