Fog-line meaning

A line painted on a road (usually bright white) that marks the edge of the legally drivable portion.
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The boundary of a body of air, contacting the earth's surface, that has fallen below the dew point and usually contains fog.
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(computing): The point in the stack descending into a portion of the program where there is no available source code, thus making debugging much more difficult. Most notably, the transition into proprietary code in a closed-source operating system.
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