1.
If you chew food up , you chew it until it is completely crushed or soft.
I took one of the pills and chewed it up.
PHRASAL VERB : V n P , also V P n (not pron)
2.
If something is chewed up , it has been destroyed or damaged in some way. ( INFORMAL )
Every spring the ozone is chewed up, and the hole appears.
...rebels who are now chewing up Government-held territory...
This town is notorious for chewing people up and spitting them out.
PHRASAL VERB : be V-ed P , V P n (not pron) , V n P