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southbound

[south-bound]
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adjective
  1. traveling southward.
  2. pertaining to southward travel.
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Origin of southbound

First recorded in 1880–85; south + -bound2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for southbound

southbound

adjective
  1. going or leading towards the south
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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

Word Origin and History for southbound

adj.

1872, originally in railroading, from south + bound (adj.2).

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Online Etymology Dictionary, © 2010 Douglas Harper