Antonyms for the phrase "be element of" include "exclude," "remove," "separate," "disconnect," and "detach." To exclude is to leave something out or reject it, while to remove is to take something away. Separating means dividing into parts, and disconnecting means to detach from a power source or a connection. Detaching refers to separating from something that is attached or connected. These antonyms are essential in describing situations where something needs to be excluded or taken away, or when a component needs to be divided or disconnected from its source. Remember that antonyms are important in providing contrast and clarity in communication.