Scottish National Dictionary (1700–)
CULLY, n. “The name in the game of marbles for the big selected marble used for shooting at the others in the ring with the hand held up. The marble is held between the thumb and the middle of the forefinger” (Gsw. 1916 T.S.D.C. II.; also Rnf.1 c.1920). Also in comb. cully-thumb, “a boy's term for shooting a marble off the middle of the forefinger instead of off the tip in the usual manner” (s.Lnk. 1905 E.D.D. Suppl.).[Cf. Eng. slang cully, a fellow, companion.]
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"Cully n.". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 12 May 2021 <https://www.dsl.ac.uk/entry/snd/cully>
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