fathom

as in to plumb
to measure the depth of (as a body of water) typically with a weighted line the pilot had to continually fathom the river, which drought conditions had lowered to unprecedented levels

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“Fathom.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/fathom. Accessed 23 Jul. 2024.

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