"Eat out of house and home" is an idiom that means to consume large amounts or more than one can afford. There are a variety of synonyms that can be used in place of this phrase, such as "consume extravagantly," "spend lavishly," "deplete resources," "devour excessively," "overspend," "exceed budget," "drain finances," and "eat up savings." These synonyms can be used in various contexts, such as when referring to overspending on holidays, buying too many things, or eating too much food. Regardless of the situation, using these synonyms can help to convey the idea of excessive consumption or spending.