swingletree

英 ['swɪŋg(ə)ltriː] 美 ['swɪŋgl,tri]
  • n. 马车前端的横木；马车梁
swingletree
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英文词源

swingletree (n.)
mid-15c., from swingle "that which swings" + tree (n.) in obsolete Middle English sense "pole."