Does anyone have a good idiom for telling someone something that they already know a lot about

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Like when your in a conversation with someone about something and your telling them about XYZ but it turns out are already experts in the subject matter, an idiom like trying to teach the teacher thanks






idiom-requests







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    Teach fish how to swim. But, if somebody tells you that your and you are are not the same, don't respond with this idiom!
    – mahmud koya
    3 hours ago











  • @mahmud koya Indeed, because this would be like teaching the deaf to hear.
    – Christian Geiselmann
    3 hours ago










  • Possible duplicate of "Teaching fish to swim"
    – Mari-Lou A
    2 hours ago










  • and also Idiom for explaining something to someone who clearly knows the topic (probably better than you)
    – Mari-Lou A
    2 hours ago
















up vote
1
down vote

favorite












Like when your in a conversation with someone about something and your telling them about XYZ but it turns out are already experts in the subject matter, an idiom like trying to teach the teacher thanks






idiom-requests







share|improve this question

















  • 2




    Teach fish how to swim. But, if somebody tells you that your and you are are not the same, don't respond with this idiom!
    – mahmud koya
    3 hours ago











  • @mahmud koya Indeed, because this would be like teaching the deaf to hear.
    – Christian Geiselmann
    3 hours ago










  • Possible duplicate of "Teaching fish to swim"
    – Mari-Lou A
    2 hours ago










  • and also Idiom for explaining something to someone who clearly knows the topic (probably better than you)
    – Mari-Lou A
    2 hours ago












up vote
1
down vote

favorite









up vote
1
down vote

favorite











Like when your in a conversation with someone about something and your telling them about XYZ but it turns out are already experts in the subject matter, an idiom like trying to teach the teacher thanks






idiom-requests







share|improve this question













Like when your in a conversation with someone about something and your telling them about XYZ but it turns out are already experts in the subject matter, an idiom like trying to teach the teacher thanks






idiom-requests




idiom-requests






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 4 hours ago









user186103

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  • 2




    Teach fish how to swim. But, if somebody tells you that your and you are are not the same, don't respond with this idiom!
    – mahmud koya
    3 hours ago











  • @mahmud koya Indeed, because this would be like teaching the deaf to hear.
    – Christian Geiselmann
    3 hours ago










  • Possible duplicate of "Teaching fish to swim"
    – Mari-Lou A
    2 hours ago










  • and also Idiom for explaining something to someone who clearly knows the topic (probably better than you)
    – Mari-Lou A
    2 hours ago












  • 2




    Teach fish how to swim. But, if somebody tells you that your and you are are not the same, don't respond with this idiom!
    – mahmud koya
    3 hours ago











  • @mahmud koya Indeed, because this would be like teaching the deaf to hear.
    – Christian Geiselmann
    3 hours ago










  • Possible duplicate of "Teaching fish to swim"
    – Mari-Lou A
    2 hours ago










  • and also Idiom for explaining something to someone who clearly knows the topic (probably better than you)
    – Mari-Lou A
    2 hours ago







2




2




Teach fish how to swim. But, if somebody tells you that your and you are are not the same, don't respond with this idiom!
– mahmud koya
3 hours ago





Teach fish how to swim. But, if somebody tells you that your and you are are not the same, don't respond with this idiom!
– mahmud koya
3 hours ago













@mahmud koya Indeed, because this would be like teaching the deaf to hear.
– Christian Geiselmann
3 hours ago




@mahmud koya Indeed, because this would be like teaching the deaf to hear.
– Christian Geiselmann
3 hours ago












Possible duplicate of "Teaching fish to swim"
– Mari-Lou A
2 hours ago




Possible duplicate of "Teaching fish to swim"
– Mari-Lou A
2 hours ago












and also Idiom for explaining something to someone who clearly knows the topic (probably better than you)
– Mari-Lou A
2 hours ago




and also Idiom for explaining something to someone who clearly knows the topic (probably better than you)
– Mari-Lou A
2 hours ago










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Teaching your grandmother to suck eggs is a classic.



look it up in Wikipedia if you wish






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    Teaching your grandmother to suck eggs is a classic.



    look it up in Wikipedia if you wish






    share|improve this answer
























      up vote
      3
      down vote













      Teaching your grandmother to suck eggs is a classic.



      look it up in Wikipedia if you wish






      share|improve this answer






















        up vote
        3
        down vote










        up vote
        3
        down vote









        Teaching your grandmother to suck eggs is a classic.



        look it up in Wikipedia if you wish






        share|improve this answer












        Teaching your grandmother to suck eggs is a classic.



        look it up in Wikipedia if you wish







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 3 hours ago









        Ricky

        13.4k43073




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