The idiom '班门弄斧' (bān mén nònɡ fǔ) means to show off one's skills or knowledge in front of an expert, akin to 'teaching your grandmother to suck eggs'.
班门弄斧（bān mén nònɡ fǔ）比喻在行家面前卖弄本领，炫耀才能。
| 正面 | 班门弄斧bān mén nònɡ fǔ |
|---|---|
| 背面 | to presume to advise a more knowledgeable or experienced person; to teach one's grandmother to suck eggs: |
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