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.
The doctor's friend was in the positive degree of hoarseness, puffiness, red-facedness, all-fours, tobacco, dirt, and brandy; the doctor in the comparative--hoarser, puffier, more red-faced, more all-fourey, tobaccoer, dirtier, and brandier.
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.
No, it has passed him, and his voice rings out clear over the advancing tide, "Look out in goal!" 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.
Not just because the campaigns will likely be dirtier than last time, but also because they will be decided by whomever can fish the most votes out of the garbage, persuading the many Israelis who "wasted" their votes on minor parties in April or did not vote to switch allegiances.
When the river's waters no longer flow, its water is no longer clean and it becomes dirtier,' he said.
This can be a life-changing exercise, as you gradually become comfortable with "dirtier" and "dirtier" objects.
Guidanian had drawn comparisons between tourism in Lebanon and Egypt, saying Egypt was "dirtier," "louder" and had more traffic "but there is tourism, because they know how to sell that country."
Vessel operators can either switch to cleaner, but more expensive, marine gasoil or install scrubbers to filter sulphur from dirtier fuel oil.