old是舊，shoe是鞋子，as common as an old shoe表示某人“不擺架子；平易近人；不賣弄；不愛虛榮；謙虛的；對人友好的”。
【例句】
Although he is a famous writer, he is still as common as an old shoe.
他雖然是個名作家，卻平易近人。
I hope that in others' eyes I am as common as an old shoe, simple and easy to approach.
我希望我自己在別人眼里可以是一個親和、容易接近的人。