Antonyms for the word "anchor it" would be words or phrases that suggest the opposite of securing or fastening something firmly in place. Some possible antonyms might include "release it," "let it go," "unmoor it," "detach it," or "unclamp it." These antonyms suggest that an object or structure is allowed to move or drift freely, without any restriction or restraint. In a figurative sense, antonyms for "anchor it" might include "shake loose," "break away," or "relinquish control," indicating a willingness to let go of one's grip and allow things to unfold in their own way.