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Over time, the word board came to signify not just the dining surface but the meal itself, which is where the board comes from in room and board. It also explains why lodgers are called boarders and why an honest person—someone who keeps his hands visible at all times—is said to be aboveboard.
The device was successfully put to use in lighthouses, but it was also taken up by theaters. The light not only was perfect and steady but also could be focused into a beam and cast onto selected performers—which is where the phrase in the limelight comes from.
The term is a shortening of the much older withdrawing room, meaning a space where the family could withdraw from the rest of the household for greater privacy, and it has never settled altogether comfortably into widespread English usage.

