Japanese edit

For pronunciation and definitions of しゃみせん – see the following entry.
三味線
[noun] [from 1580] a Japanese stringed instrument played by plucking, vaguely similar to a banjo
[noun] [after 1780] short for 三味線草 (shamisen-gusa): the shepherd's purse, Capsella bursa-pastoris
[noun] [after 1780] from 三味線を弾く (shamisen o hiku, literally to play the shamisen): words or actions intended to deceive one's opponent in a game or competition
[noun] [from 1930] (academia, slang) a grade of (, highest mark, equivalent to an “A” in US schools) (from the vague visual similarity between the character and the shape of the shamisen)
(This term, しゃみせん, is the hiragana spelling of the above term.)