5 entries under idiom topic. ×

1
Davy Jones's locker(noun, expression, blue, water)
1
black hole(noun, expression, blue, water)
1
blue water(noun, expression, blue, water)
1
high seas(noun, expression, blue, water)
1
seven seas(noun, expression, blue, water)
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APASmart Define. (2015). hydrothermal vent thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/hydrothermal_vent/thesaurus/related
ChicagoSmart Define. 2015. "hydrothermal vent thesaurus" https://smartdefine.org/hydrothermal_vent/thesaurus/related (accessed October 1, 2026).
HarvardSmart Define 2015, hydrothermal vent thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/hydrothermal_vent/thesaurus/related>.
MLASmart Define. "hydrothermal vent thesaurus" 20 March 2015. Web. 1 October 2026. <https://smartdefine.org/hydrothermal_vent/thesaurus/related>