Pronunciation: (sīd'slip"), [key]
—v., -slipped, -slip•ping,
1. to slip to one side.
2. (of an airplane when banked excessively) to slide sideways in a downward direction, toward the center of the curve described in turning.
an act or instance of sideslipping.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.