CAN ANYONE RECOMMEND A PRODUCT I CAN BUY TO PUT AT THE BOTTTOM OF MY APPLIANCES TO STOP FOOD DEBRIS ROLLING UNDERNEATH?

Edit to Add: Yeah, a thick base would keep things from being easily kicked or pushed under a washer. Just make sure it's secured in such a way that the movement of the washer doesn't 'dance' it aorund the room or cause the washer to 'dance' off of it.  

...   A plinth is a base to a statue.  What that 'someone' was suggesting is putting this appliance up on a thick base, which would both allow for air flow and keep debris from getting under it.  What I recommend is a baseboard, or toekick, depending on which appliance it is.  Appliances which fit under the cabinet are made to have the 'toe kick' placed in front, which both keeps debris out, and finishes the look of the cabinets.  If this is a fridge, you're not going to want to block up the base.  Check teh fridge carefully, as most have a vent piece which fits on the front to keep stuff from rolling under.  This could be missing.  Lastly, the idea of putting the fridge up on a 'plinth' is not so bad, as even an inch base of solid wood would keep a lot of debris out of the bottom of teh fridge.  Just be sure you're not blocking air flow. 

Seems it shouldn't be difficult to keep FOOD debris from under a WASHING MACHINE . . . . . at least as easy as keeping the dirty socks away from the refrigerator.  Where are you, India???