There are several synonyms for the phrase "hook on" which can be used to express the same meaning. Some of the commonly used synonyms include 'become enamored,' 'get attached,' 'be infatuated,' and 'develop a fondness for.' These synonyms denote a feeling of attraction or emotional attachment towards a person, thing, or activity. Other possible alternatives for "hook on" could be 'obsess over,' 'be addicted to,' 'cultivate an interest in,' and 'form a bond.' Regardless of the exact synonym employed, each of these phrases suggests a deep connection with something or someone, signifying a feeling of passion, enthusiasm, and dedication.