"Catch the flame" is a commonly used expression to depict the act of starting a fire or becoming passionate about something. However, there are various synonyms that can be used to convey the same meaning. For instance, "ignite the spark," "kindle the fire," "light the torch," "fan the flame," "fuel the fire," "stoke the blaze," "start the inferno," "set ablaze," "awaken the fervor," and "arouse the passion" are some of the ideal equivalent words for "catch the flame." Whether it's a romantic relationship or a new hobby, using these synonyms can add depth and flair to your writing or conversation.