The phrase "pulls one's leg" is commonly used to mean joking or teasing someone. Some antonyms for this phrase could be "being serious," "telling the truth," "speaking honestly," or "being sincere." When someone is pulling your leg, they are not being truthful or serious, so these antonyms imply the opposite. Other antonyms for this phrase could be "being straightforward," "being genuine," or "meaning what you say." Using an antonym of "pulling one's leg" would convey the opposite meaning and indicate that you are not joking, but rather being straightforward and honest.