The phrase "pull one's leg" is commonly used to refer to joking or teasing someone in a playful manner. However, there are several antonyms for this phrase that signify more serious, truthful actions. Some of the antonyms include "tell the truth," "be genuine," "be honest," "be sincere," and "be straightforward." These antonyms convey the importance of honesty and straightforwardness in communication and interaction with others. While pulling someone's leg may be a lighthearted way to communicate, it is crucial to be honest and transparent in other situations to build trust and maintain strong relationships.