fill up in WordNet English dictionary

1. fill or stop up
   "Can you close the cracks with caulking?"
   close  fill up 
   
2. become full
   "The pool slowly filled with water"; "The theater filled up slowly"
   fill  fill up 
   
3. make full, also in a metaphorical sense
   "fill a container"; "fill the child with pride"
   fill  fill up  make full 
   
4. eat until one is sated
   "He filled up on turkey"
   fill up  fill 
   

fill up in English Wiktionary