The phrase "bends one ear" typically refers to someone who is talking non-stop or incessantly, possibly about a topic that might not be of interest to the listener. Antonyms for this phrase would be expressions that denote a quieter or more restrained form of communication, such as "keeps mum" or "holds one's tongue." Other antonyms that could be used to convey a sense of reserve or timidity include "holds back," "restrains oneself," or "checks oneself." These terms suggest that the speaker is being careful not to say too much or to overwhelm the listener with their words, providing a noticeable contrast to someone who "bends one ear" without reservation.