up

how come the word up has so many meanings?
up first,you can throw a ball up in the air,or throw up in the toilet.
you can climb up onto a chair,then sit up in it.
or the phase,"coming up next".
you can speak up in class,get up from your seat at recess,or wake up from a nap.
are things looking up for you now?
or maybe you're just fed up with all this- is it my fault? am I messing up?
maybe I'm not living up to your expectations-I guess I just don't measure up.
can you think up any more?
I can't find my dictionary, so I can't look it up...please comment if you can.