The phrase "die for" implies a strong desire or willingness to sacrifice oneself for something or someone. Some synonyms for this phrase include "crave," "yearn," "long for," and "lust after." Other options might include "pine for," "hunger for," or "hanker after." Each of these phrases suggests a deep passion or longing for something that one would be willing to go to great lengths to obtain or achieve. When used in context, these synonyms can add rich nuance and emotion to written or spoken language, allowing the speaker or writer to convey a vivid sense of desire or need.