The antonyms for the word "re-tains" are release, let go, free, liberate, relinquish, abandon, surrender, and waive. Each of these words represents a different action or state of being that opposes the concept of retaining. To release something means to set it free, while letting go implies a sense of detachment or abandonment. Similarly, the words "free" and "liberate" emphasize the idea of removing restrictions or limitations. To relinquish means to surrender control or possession, while abandoning suggests a more proactive decision to sever ties with something. Finally, the words "surrender" and "waive" both imply a voluntary give-up, whether it be rights or possessions.