teachˈless adjective (archaic)

Incapable of being taught

teacher-govˈernor noun

A teacher who has also been elected to his or her school's board of governors

teachˈ-in noun

A long public debate consisting of a succession of speeches by well-informed persons holding different views on a matter of general importance, usu with discussion, etc

teaching aid noun

Any object or device used by a teacher to help to explain or illustrate a subject

teaching fellow noun

A postgraduate student who receives tuition, accommodation, etc in return for teaching duties

teaching hospital noun

A hospital in which medical students are trained

teaching machine noun

Any mechanical device capable of presenting an instructional programme

teaching practice noun

A trainee teacher's temporary period of teaching in a school, usu under supervision

teach school (N American)

To be a teacher in a school

teach (someone) a lesson

To bring home to (someone) his or her folly

that'll teach you, him, etc (informal)

That (unpleasant experience) will teach you, him, etc to behave better, be more careful, etc next time