Plain English Meaning
When you fly the turn-around portion of an instrument approach, you cannot let your airspeed indicator read more than 200 knots. Going faster could carry you outside the area that has been checked for obstacles.
Full Definition
A maximum airspeed limit of 200 knots, read directly from the airspeed indicator, that applies to aircraft flying a procedure turn or course reversal during an instrument approach. The restriction is set by regulation to keep the aircraft within the protected airspace designed around the procedure.
Context Anchor
Seen in instrument procedure instructions, including course reversal procedures, where a maximum speed may be stated for staying within the expected maneuvering area.