1) to teach
    1a) to hold discourse with others in order to instruct them,
        deliver didactic discourses
    1b) to be a teacher
    1c) to discharge the office of a teacher, conduct one's self
        as a teacher
 2) to teach one
    2a) to impart instruction
    2b) instill doctrine into one
    2c) the thing taught or enjoined
    2d) to explain or expound a thing
    2f) to teach one something