Detruncates is a verb that means to remove or cut off a part of something. Some antonyms, or opposite words, for detruncates could include: attach, add, grow, extend, elongate, lengthen, augment, expand or develop. These words imply the act of adding something to a whole, rather than removing a part. Other antonyms could be words that imply repairing or reattaching something that has been detrunctaed, such as mending, fixing, or restoring. In general, words with opposite meanings to detruncates would imply the act of making something whole or complete, rather than taking something away from it.