verb

• (ditransitive) To pass on knowledge to.
  "Can you teach me to sew?  Can you teach sewing to me?"
• (intransitive, stative) To pass on knowledge generally, especially as one's profession; to act as a teacher.
  "She used to teach at university."
• (ditransitive) To cause (someone) to learn or understand (something).
  "The humor of my proposition appealed more strongly to Miss Trevor than I had looked for, and from that time forward she became her old self again;[…]. Now she had come to look upon the matter in its true proportions, and her anticipation of a possible chance of teaching him a lesson was a pleasure to behold."
• (ditransitive) To cause to know the disagreeable consequences of some action.
  "I'll teach you to make fun of me!"

noun

• (informal, usually as a term of address) teacher

name

• (slang) Nickname for a teacher.
  "I'm not in trouble again, am I, Teach?"