The phrase "to cover the meat" means to place something, like a lid or foil, over the meat to keep it protected or to help it cook evenly. Full definition
Add all other ingredients and top with enough water to just cover the meat. (changs.com)
You can do this several hours ahead of time if you want, but be sure to cover the meat completely with plastic wrap and refrigerate until needed. (theviewfromgreatisland.com)