graze
To eat a lot of food without actually having a proper meal, usually in the context of picking at food that is readily available at a buffet.
Example:
"Okay, I'm off to the buffet to graze for a while"
"Has anyone seen Susan?"
"Last I saw she was grazing in the kitchen"
"Okay, I'm off to the buffet to graze for a while"
"Has anyone seen Susan?"
"Last I saw she was grazing in the kitchen"