Round-trip light time is the total time it takes for a beam of light to travel from a source to a target and then back to the original source. This concept is commonly used in astronomy and space exploration to calculate distances between celestial bodies or spacecrafts, and it is based on the constancy of the speed of light.
Tripping her up
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to fall because you hit your foot on something, or to make someone fall by putting your foot in front of the other persons foot:
Tripping her up meaning & definition 1 of Tripping her up.
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to make a mistake, or to cause someone to make a mistake:
Tripping her up meaning & definition 2 of Tripping her up.
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