1 a wrong judgment another misstep like that, and the company could go belly-up Synonyms misapprehension, miscalculation, misjudging, misjudgment, mistake, slip, slipupRelated Words blunder, boner, boob [British], clinker, errancy, error, fault, flub, fumble, gaffe, goof, inaccuracy, lapse, miscue, stumble, trip; foul-up, muff; misstatement; ...
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A ray is a thin beam of light that travels in a straight line. A wave front is the line (not necessarily straight) or surface connecting all the light that left a source at the same time. For a source like the Sun, rays radiate out in all directions; the wave fronts are spheres centered on the Sun.