The phrase "kill by inches" is often used to describe a slow and painful death, either physically or emotionally. There are many synonyms for this phrase, including "torture," "agonize," "wear down," "gradual demise," "prolonged suffering," "slow death," "drawn-out pain," and "slowly wither away." These phrases convey the same idea of a gradual decline, where the person or situation is being slowly destroyed over a long period of time. Often, this type of suffering is more difficult to endure than a quick, decisive end, as it can prolong the agony and leave the victim feeling helpless.