southbound

Etymology

It is formed from English south + bound,^[2][3][4] the second part being the adjective meaning going or heading towards a place,^[3] which goes back to Middle English boun (“ready to go”).^[3]

Earliest recorded meaning

Heading or travelling southwards: 1850, in D. Millar's Tay.^[2] Merriam-Webster gives 1655 as its first known use, while Etymonline dates it to 1872 and Dictionary.com to 1880–85.^[5][3][4]

Semantic evolution

According to Etymonline the word was first used in railroading, of trains travelling south.^[3] From 1881 it also described roads or lanes intended for traffic going south, from 1891 it was used as an adverb, and in American English from 1903 it was a noun for a southbound train.^[2]

Timeline

• 1850 – heading or travelling south.^[2]
• 1881 – of a road or lane, for traffic going south.^[2]
• 1891 – adverb, towards the south.^[2]
• 1903 – noun, a southbound train, in O. Henry (US).^[2]

Meanings

Adjective

1. Travelling or heading towards the south: The southbound bus was delayed by snow.^[6][5][2]
2. Of a road or lane: used by traffic going south.^[2][6]

Adverb

1. Towards the south.^[2]

Noun

1. (US) A train travelling south.^[2]

Related words

• southward
• eastbound
• northbound
• westbound

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
5. ^ a b Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
6. ^ a b Collins English Dictionary (2023), Glasgow: HarperCollins