mainsubject
nounUK /ˈmeɪn ˈsʌbdʒɪkt/
US /ˈmeɪn ˈsʌbdʒɛkt/
The main subject is the most important thing you are talking about or looking at.
In the painting, the big red barn is the main subject.
RELATED WORDS
OTHER MEANINGS
2. The most important person or thing in a picture or photo.
The puppy is the main subject of the photograph.
3. The central idea of a book, story, or lesson.
Friendship is the main subject of the story.
4. The most important class or course a student studies.
Math is her main subject this year.