A schoolmarm is a woman who teaches at a school, especially in the past.
The word schoolmarm can make people think of old-fashioned schools and strict teachers.
Examples:
The schoolmarm teaches the children.
The schoolmarm is very kind.
The children like the schoolmarm.
The schoolmarm wears old-fashioned clothes.
In the old days, the schoolmarm was the boss of the school!
The schoolmarm's classroom is very tidy.