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 periodicals archive ?
Guttmann would rather have continued with ten men than an 11th who was playing dirtily, let alone one whose violence could have ended the career of his victim.
In a game that parallels the invented languages used by some dissident Eastern European theatre troupes during Communist occupation, Tom Smothers also instructed cast and crew to laugh dirtily and knowingly when certain random trigger phrases were spoken--for example, 'rowing to Galveston'--so that their CBS minders became convinced that another revolting piece of underground erotic or narcotic argot was being smuggled in.
I'm not suggesting that it was done dirtily, they had told Andy all about it and he was agreeable.