'wake up' means: to become completely awake
'eat up' means: to eat all the food
'man up' is an expression that means: be a man, don't be soft or weak
'sit up' means: sit tall with your back straight
'type up' means: to type a complete piece, for example: I'll type up an essay tonight.
adding 'up' to a verb usually means: to do the thing completely
