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sea gauge

American

noun

an automatic sounding device registering the depth to which it is lowered.
the draft of a vessel.

Etymology

Origin of sea gauge

First recorded in 1745–55

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.