sin·gle·ton /ˈsɪŋgəltən/
一個,獨生子,獨身
Sin·gle·ton n. In certain games at cards, as whist, a single card of any suit held at the deal by a player; as, to lead a singleton.
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singleton
n 1: a single object (as distinguished from a pair)
2: a set containing a single member
3: the playing card that is the only card in a suit held in a
bridge hand as initially dealt