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long tom

American  

noun

(usually initial capital letters)

  1. a towed 155 mm field cannon produced by the United States throughout World War II.

  2. a long, heavy cannon formerly carried by small naval vessels.

long tom British  

noun

  1. a long swivel cannon formerly used in naval warfare

  2. a long-range land gun

  3. an army slang name for cannon

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of long tom

First recorded in 1825–35

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.