Definitions from Wiktionary ( )

▸ verb:  (ditransitive) To pass on knowledge to.
▸ verb:  (intransitive, stative) To pass on knowledge generally, especially as one's profession; to act as a teacher.
▸ verb:  (ditransitive) To cause (someone) to learn or understand (something).
▸ verb:  (ditransitive) To cause to know the disagreeable consequences of some action.
▸ verb:  (obsolete, transitive) To show (someone) the way; to guide, conduct; to point, indicate.
▸ noun:  (informal, usually as a term of address) teacher
▸ noun:  (slang) Nickname for a teacher.
▸ noun:  A surname. Most commonly associated with the pirate Blackbeard, who gave his real name as Edward Teach, Thatch, or Tack.

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