knacker

• n. 屠马业者；收买废屋船业者
• vt. 阉割；杀死

可能来自古诺斯语hnakkur,马鞍，hnakki,马背，词源同neck.后引申词义老马，像老马一样筋疲力尽。词义杀死可能来自knack,击，打，砍杀。

knacker (v.)

usually in past tense, knackered, "to kill, castrate" (1855), but most often used in weakened sense of "to tire out" (1883); apparently from knacker (n.) "worn-out or useless horse," 1812, of unknown origin; possibly from a dialectal survival of a Scandinavian word represented by Old Norse hnakkur "saddle," hnakki "back of the neck," and thus possibly related to neck (n.).

1. Her horse was a show jumper whom the family rescued from the knacker's yard.

她的马擅长跨越障碍，是家人从废马屠宰场挽救回来的。

来自柯林斯例句