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Meaning of 关公面前耍大刀

Lookup via: Pinyin | Radicals
guān gōng miàn qián shuǎ dāo (Trad.: 關公面前耍大刀)
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