The phrase "reserve resources" refers to keeping back something for future use or emergency situations. There are several synonyms for the word reserve resources, such as stockpile, stash, hoard, accumulate, save, and conserve. A stockpile is a large quantity of goods or resources that is kept for future use. Stash means to hide or store something secretly. Hoard pertains to collecting and storing things obsessively, while accumulate is to gather things gradually over time. Saving refers to keeping back something for future use, while conserve means to preserve and protect something for future use. All these words are great alternatives for expressing the idea of reserving resources to be utilized at a later time.