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drop-cannon
drop-cannon n.
Brit. 
/ˈdrɒpˌkanən/
, /ˈdrɒpˌkanən/U.S. /ˈdrɑpˌkænən/
Billiards a variety of cannon./ˈdrɑpˌkænən/ΚΠ
1904 J. P. Mannock & S. A. Mussabini Billiards Expounded I. 336 The plain ‘drop cannon’ which is employed to gather the balls between the two top pockets.
1909 Westm. Gaz. 2 Feb. 12/3 He unexpectedly missed a rather wide drop-cannon from hand.
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