班門弄斧 (baan1 mun4 lung6 fu2) — to show off one's beginner skills in front of an expert [Syn]關公面前耍大刀 in Cantonese
baanˉ¹班munˎ₄門lungˍ₆弄fuˊ²斧简 班门弄斧
Mandarin Pinyin: ban1 men2 nong4 fu3
Meaning of 班門弄斧
nounto show off one's beginner skills in front of an expert [Syn]關公面前耍大刀