deep blue sea

noun

The sea, the ocean, the open sea.

Ask AI about this wordChatGPTClaudePerplexityGoogle AIGrok

Meanings

noundeep blue sea (countable and uncountable, plural deep blue seas)

plural deep blue seas

  1. countableuncountableThe sea, the ocean, the open sea.

Origin

From deep + blue + sea. Compare Old Norse blá djúp (“deep blue sea”).

Full word history & related roots →
Cite this entry
APA

deep blue sea. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/deep%20blue%20sea

MLA

“deep blue sea.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/deep%20blue%20sea. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “deep blue sea,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/deep%20blue%20sea.

Source: deep blue sea on Wiktionary, CC BY-SA 4.0.