Anonymous wrote:If you don't use a knife, it won't dull with age. You can just use the other one, but don't toss the first: sharpen it.
And have you been using that one knife to cut cooked food? If so, OK. But if you've been using it to prepare food, get yourself a real knife.
You can get a very goods chef's knife for under $50. https://www.nytimes.com/wirecutter/reviews/the-best-chefs-knife-for-most-cooks/