Definition of teach (someone) a lesson
- I'm glad they got caught. That will teach them a lesson!
: to cause to know something
: to cause to know how
: to accustom to some action or attitude
: some person : somebody
: a passage from sacred writings read in a service of worship
: a piece of instruction
: a reading or exercise to be studied by a pupil
: to give a lesson to : instruct
: lecture, rebuke
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