小巫见大巫xiǎo wū jiàn dà wū

小巫师见了大巫师，法术就施展不开了。比喻两者之间高下悬殊，差距太大，不能比拟。

例今景兴在此，足下与子布在彼，所谓小巫见大巫，神气尽矣。——汉·陈琳《答张紘书》

英like a small sorcerer in the presence of a great one——feel dwarfed; pale into insignificance by comparison; the moon is not seen where the sun shines;