1. To express in another language, while systematically retaining the original sense: construe, put, render. See words.
2. To express the meaning of in other, especially simpler, words: paraphrase, render, rephrase, restate, reword. See words.
3. To change into a different form, substance, or state: convert, metamorphose, mutate, transfigure, transform, transmogrify, transmute, transpose, transubstantiate. See change/persist.