“thumb”是拇指，“thumbs down”就是拇指向下。大家想，这个手势不就是经典的表示否定、反对、不赞成的意思。

【例句】
Peters turned thumbs down on going to the exhibition.
彼得一家不赞成去展览馆。

Their proposals were given the thumbs down.
他们的建议遭到拒绝。