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clack valve

American

noun

a valve having a hinged flap permitting flow only in the direction in which the flap opens.

Etymology

Origin of clack valve

First recorded in 1855–60

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.