Antonyms for the phrase "blows whistle on" may include phrases such as "avoids confrontation," "keeps silent," "protects," "conceals," "hides," "favors," "shields," "covers up," "defends," "supports," and "collaborates." These antonyms are contrary to the act of disclosing misconduct, wrongdoing or illegal activity, which is what the phrase "blows whistle on" signifies. Therefore, the antonyms imply that the speaker refrains from exposing any information that may cause harm or negative consequences to someone or something else. In certain situations, such as in cases of social, legal, or ethical dilemmas, choosing the antonyms may be seen as a form of collaboration with the offender.