to display one's slight skill in the presence of a master, literally meaning to wield a large axe in front of Lu Ban's door

to display one's mediocre skills in front of a master of the craft; literal meaning: to swing a large axe in the presence of the master carpenter Lu Ban

To display one's slight skills in the presence of a master; used to describe someone who overestimates their own abilities. Also written as [[鲁班门前弄大斧|魯班門前弄大斧|lu3 ban1 men2 qian2 nong4 da4 fu3]] or [[鲁般手里调大斧|魯般手裡調大斧|lu3 ban1 shou3 li3 tiao2 da4 fu3]].