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A light on the instrument panel of a motor vehicle that gives forewarning, as of an overheated engine.
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|Noun||1.||idiot light - a colored warning light on an instrument panel (as for low oil pressure)|
control board, control panel, instrument panel, board, panel - electrical device consisting of a flat insulated surface that contains switches and dials and meters for controlling other electrical devices; "he checked the instrument panel"; "suddenly the board lit up like a Christmas tree"