guān​gōng​miàn​qián​shuǎ​dà​dāo

to show off to an expert

关公面前耍大刀 關公面前耍大刀 guān​gōng​miàn​qián​shuǎ​dà​dāo
to show off to an expert
Literally to wield a broadsword in front of Lord Guan; used to describe someone making a fool of themselves by showing off their meager skills in the presence of a master of that craft.

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Synonym