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1. To rush out of something, as of a liquid. I pulled out the bathtub's stopper, causing the water to flow out.
2. By extension, to move or spill quickly out of someone in a fluid, effortless manner. I couldn't stop myself, even though I knew I was rambling—the words just kept flowing out.
3. To move quickly out of some place or thing in large numbers. As soon as the dismissal bell rang, kids began flowing out.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
flow out(of something)
1. Lit. to course out of something. The apple juice flowed out of the press as we turned the crank. It stopped flowing out when we had crushed the apples totally.
2. Fig. [for people] to issue forth from something. The people flowed out of the stadium exits. At the end of the game, the people flowed out in a steady stream.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.