"De truncates" is not a valid term in the English language. It is possible that the intended term is "truncate". Truncate means to cut short or reduce the length of something. Some of the antonyms for truncate include extend, elongate, prolong, lengthen, and stretch. These words imply the opposite of truncating a particular object or subject. Extending or lengthening something refers to making it longer or increasing its length. Stretching implies the act of elongating and building upon an already existing structure. In contrast, truncating means to shorten or reduce something. Therefore, the antonyms mentioned for the word "truncate" are phrases that signify lengthening or elongating.