Plain English Meaning
Flying away from a radio beacon along a chosen line on the ground, using the ADF needle to stay on that line and adjusting heading to cancel out any wind drift.
Full Definition
The procedure of flying a desired course away from a non-directional beacon (NDB) using the automatic direction finder (ADF), where the pilot maintains the selected magnetic bearing from the station by applying wind correction so that the aircraft's actual ground track matches the intended away from the NDB.