The word 'sushi' entered English directly from Japanese in the late 19th century, reflecting the globalization of cuisine. Its ultimate origin lies in a Japanese adjective 'sushi', meaning 'sour', which describes the distinctive tart flavor of the vinegared rice that is the essential component of the dish. This term evolved from the older compound 'sushi-meshi' (sour rice). As sushi gained international popularity in the latter half of the 20th century, the word became a standard English noun, shedding its inflected Japanese origins and representing the entire culinary concept.

The word 'sushi' is a Japanese loanword adopted into English. It is not productively segmented using English or classical morphemes. In its original language, it is believed to derive from an archaic grammatical form 'sushi-meshi', where 'sushi' means 'sour' (referring to the vinegared rice) and 'meshi' means 'rice'.