班門弄 <to teach someone something that he already knows>

= to teach ones grandmother to suck eggs <idiom>

= to teach fish how to swim

= to show off in front of an expert

 

For example:

I just gave instruction to him on how to set up a computer.  I didnt realize that he is a computer technician.  How embarrassing!  It is like teaching fish how to swim.   

 

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