Etymology

choy sum

Today it means: A Chinese vegetable, a variety of Brassica rapa parachinensis subspecies, similar to bok choy but slimmer, with smooth green leaves and pale green stems, and clusters of flowers on the tips of the inner shoots. Full definition →

Cantonese 菜心
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The story

  1. Cantonese · borrowed from菜心
  2. English todaychoy sum

Borrowed from Cantonese 菜心 (coi3 sam1, literally “vegetable heart”). Doublet of caixin.

Etymology from Wiktionary, CC BY-SA 4.0.