drop seat
Americannoun
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a hinged seat, as in a taxicab or bus, that may be pulled down for use when an additional seat is needed.
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a rear panel, as on long one-piece underwear or children's pajamas, that may be opened and lowered separately.
Etymology
Origin of drop seat
First recorded in 1925–30
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.