To run in order to escape something or to reach a destination quickly, perhaps before a certain time or before something happens. Our taxi was late picking us up, so we're going to have to run for it when we get to the station.I couldn't wait to get out of school, and I ran for it as soon as the bell rang.
to escape by running. (See also swim for it.) The dogs were coming after me fast. There was nothing I could do but run for it. I ran for it when I saw the police coming.
Also, run for one's life. Depart as fast as possible, either to escape danger or to reach something quickly. For example, You'd better run for it before the teacher catches you, or The bully is coming after you-run for your life! The for it in the first term almost certainly means "for one's life"-that is, to save one's life, a usage that can be literal or hyperbolic. Also see for dear life; make a break for it.
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