Never turn a loaf in the presence of a Menteith Sir John Stewart de Menteith was the person who betrayed Sir William Wallace to King Edward His signal was, when he turned a loaf set on the table, the guests were to rush upon the patriot, and secure him (Sir Walter Scott: Tales of a Grandfather, vii )
{i} mass of bread which is shaped into a rectangular or rounded form and baked in one piece; mass of chopped meat or other food that has been shaped into a rectangular or rounded form; head (British Slang)