"Am beck call" is actually an idiomatic expression, which means that someone is at someone's beck and call. The phrase is used to indicate that an individual is always available or waiting for someone's command or service.
Some antonyms for "am beck call" could include independence, self-sufficiency, autonomy, and self-reliance. These words imply that someone is not at the whim of another individual and is capable of taking care of oneself.
Other antonyms for "am beck call" could be detachment, separation, or distance, which refer to someone who is emotionally or physically removed from others and does not feel obligated to be at someone's beck and call. Essentially, any words that convey a sense of personal freedom or detachment could be considered antonyms for this phrase.