1.
lessons, classes taken as a hobby or for personal development
Regular lessons or classes taken outside of school or work, typically as a hobby or for self-improvement. Includes activities like piano, swimming, calligraphy, martial arts, and similar pursuits.
Usage
A very common word in conversations about children's activities and adult hobbies. In Japan, it is typical for children to have multiple 習い事 (piano, 書道, swimming, English, etc.) alongside school. Adults also use this word for hobby classes they attend regularly.