Re-up is a verb that means to replenish or renew supplies, resources, or a drug addiction. There are several synonyms that can be used to replace the word re-up, including refill, restock, resupply, renew, refresh, and rearm. These synonyms are often used interchangeably, and their usage depends on the context. For instance, the word refill is used to replace the word re-up when referring to refilling a prescription or a gas tank. On the other hand, resupply, restock, and renew are synonyms for re-up when referring to replenishing materials, resources, or equipment. Overall, using synonyms for re-up helps to broaden vocabulary and avoid repetition in writing and speech.