Longman Dictionary of Contemporary English - mountain

~ n 1 a very high hill  (the Rocky Mountains | a mountain rescue team) 2 also mountains plural a very large pile or amount of something  (My mother-in-law always gives me a mountain of potatoes from her garden. | I've got mountains of washing to do.) 3 butter/grain etc mountain a very large amount of food that is stored in order to prevent prices from becoming lower, especially by the European Union  (- compare lake (2)) 4 make a mountain out of a molehill to treat a problem as if it was very serious when in fact it is not