schoolmarm

Short definition from Wiktionary

Noun

1. 1
   A female teacher, especially one seen to be old-fashioned and extremely severe and strict.
2. 2
   Someone who acts like a schoolmarm; a person acting harsh and stern.
3. 3
   A tree with two or more trunks; a forked tree.

Verb

1. 1
   To discipline in the manner of a schoolmarm; to harshly reprimand or chide.