There are several synonyms for the phrase "put someone on," which means to deceive or play a trick on someone. Some alternative phrases include "pulling someone's leg," "having someone on," "messing with someone," and "joking around with someone." Other similar expressions include "teasing someone," "ribbing someone," and "playing a practical joke on someone." Regardless of the exact wording, these phrases all describe the act of deceiving or misleading someone for a humorous or playful purpose. It's important to remember, however, that playing tricks on others should always be done in good fun and with the other person's consent.