Hitting it off is a phrase that refers to establishing a good connection with someone. It's a common expression used when two people get along very well from the start. There are several synonyms to this phrase, including "clicking," "bonding," "connecting," "meshing," and "jelling." Clicking refers to the feeling of getting along with someone, while bonding refers to creating a close and meaningful relationship. Connecting is similar to hitting it off because it refers to the establishment of a connection with someone. Meshing and jelling are used to describe when two people or things blend together harmoniously. All of these synonyms have the same connotation as hitting it off and can be used interchangeably.