dirty

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dirty

1. (of a colour) not clear and bright; impure
2. (of an aircraft) having projections into the airstream, such as lowered flaps

dirty

An aircraft configuration in flight with the undercarriage and/or flaps down. Airbrakes or spoilers may or may not be extended.
References in classic literature ?
Climbing up another perpendicular flight, composed with great mechanical ingenuity of nothing but corner stairs, Mr Ralph Nickleby stopped to take breath on the landing, when he was overtaken by the handmaid, whom the politeness of Miss La Creevy had dispatched to announce him, and who had apparently been making a variety of unsuccessful attempts, since their last interview, to wipe her dirty face clean, upon an apron much dirtier.
It was a hack like any other, only a trifle dirtier, with a greasy line along the top of the drab cushions, as if it had been used for a great many Irish funerals.
The house in Thavies Inn had bills in the windows annoucing that it was to let, and it looked dirtier and gloomier and ghastlier than ever.
Crab Jones catches it for a moment; but before he can kick, the rush is upon him and passes over him; and he picks himself up behind them with his straw in his mouth, a little dirtier, but as cool as ever.
The house fronts looked black enough, and the windows blacker, contrasting with the smooth white sheet of snow upon the roofs, and with the dirtier snow upon the ground; which last deposit had been ploughed up in deep furrows by the heavy wheels of carts and waggons; furrows that crossed and recrossed each other hundreds of times where the great streets branched off; and made intricate channels, hard to trace in the thick yellow mud and icy water.
And the cloths and sponges we wash up with can be dirtier than the average toilet seat.
A ban on the use of petroleum coke, a dirtier but better-burning alternative to coal, is spurring expectations India will buy even more coal from the United States in coming months.
We cannot allow corporate polluters to benefit at the cost of either the people of the Gwichin Nation, whose livelihoods depend on the Arctic Refuge, or at the cost of working families and the middle class who are already being forced to breathe dirtier air and drink dirtier water as a result of Trump and Senate Republican efforts.
A failure to tackle climate change will mean more extreme weather, dirtier air and water, and more food shortages.
It (the election) is going to be dirtier and dirtier.
MOTORWAY service station restaurants are dirtier in the South East than the rest of Britain, recent tests found.
Over that seven-year span, VW had advertised its vehicles as "clean diesel," when in fact their emissions were dirtier than the law allowed, the FTC said.