关公面前耍大刀
guān gōng miàn qián shuǎ dà dāo
lit. to wield the broadsword in the presence of Lord Guan (idiom)
fig. to make a fool of oneself by showing off in front of an expert
guān gōng miàn qián shuǎ dà dāo
lit. to wield the broadsword in the presence of Lord Guan (idiom)
fig. to make a fool of oneself by showing off in front of an expert