drop seat
noun
a hinged seat, as in a taxicab or bus, that may be pulled down for use when an additional seat is needed.
a rear panel, as on long one-piece underwear or children's pajamas, that may be opened and lowered separately.
Origin of drop seat
First recorded in 1925–30
Words nearby drop seat
drop pass,
drop press,
drop rudder,
drop scene,
drop scone,
drop seat,
drop shipment,
drop shipper,
drop shot,
drop siding,
drop table