Source: Warhammer Fantasy: 4th Edition

Turn
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A unit can only turn once during its move. To turn a unit of troops all the models remain in place, but are turned round through 90 or 180 degrees to face their side or rear. To make a turn a unit must surrender a quarter of its move - a unit with a move of 4" must give up 1" to turn for example.

turn
A unit of 15 models in 3 ranks turns 90° to its right flank. The unit still has 15 models but is now 5 ranks deep.