Expressions familières françaises #1 What does "en avoir gros sur le coeur/la patate" means?

Hi everyone. I'm Felix from France. I'm a digital nomad, artist, polyglot teacher and humanitarian worker. Living all over the place, languages are a big part of my daily life as a work tool, vernacular and cultural way to express and interacts with my people and communities around the places. I currently speak 5 languages and look for more in the future!! Working as language teacher on italki for over 3 years, I truly love the platform and the way it gathers people together for the sake of learning and discovering. Well, I don't know what more I could say here but I wish you all a great day!!!! Greetings from Lebanon!