The word "reclaim" means to regain possession of something or take back what was lost. Antonyms for this word include relinquish and surrender, which mean to give up something willingly. Other antonyms include abandon, disown, and renounce, which mean to reject or disavow ownership of something. Additionally, dispossess means to take away something that was previously possessed, while forfeit means to lose something as a consequence of a particular action or decision. Finally, neglect means to fail to take care of or give attention to something, which could result in losing possession of it.