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teach

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teach/ˈtiːtʃ/verb
teachestaught/ˈtɑːt/teaching
teach
/ˈtiːtʃ/
verb
teachestaught/ˈtɑːt/teaching
Learner's definition of TEACH  
: to cause or help (someone) to learn about a subject by giving lessons
[+ object]
[no object]
   b [+ object] : to give lessons about (a particular subject) to a person or group
   c [+ object] : to cause or help (a person or animal) to learn how to do something by giving lessons, showing how it is done, etc.— often followed by to + verb
[+ object] : to show someone how to behave, think, etc.
[+ object]informal : to cause (someone) to know the unpleasant results of something

you can't teach an old dog new tricks

— see 1dog
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