drop seat

American  

noun

1. a hinged seat, as in a taxicab or bus, that may be pulled down for use when an additional seat is needed.

2. a rear panel, as on long one-piece underwear or children's pajamas, that may be opened and lowered separately.

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Etymology

Origin of drop seat

First recorded in 1925–30

Example Sentences

If pleats feel old-fashioned to you, squint your eyes and you may notice that the carrot shape echoes the longer, “drop” seat and cinch cuffs of jogger pants, which over the past few years have been a trendy style for more progressive street-wise labels like Tim Coppens, Public School and Neil Barrett.

From The Wall Street Journal