throng in

throng in

To crowd in(to some place) all at once. Reporters thronged in shortly after the incident to interview the woman who had thwarted the attempted robbery. Tens of thousands of people have begun thronging in the streets to protest the controversial legislation.
See also: throng
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

throng in(to something)

[for a crowd] to swarm into some place. The eager crowd thronged into the department store to partake in the advertised sale. The doors opened and they thronged in.
See also: throng
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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References in classic literature ?
Among the rest there was a group of those merry imps, who, after smashing the glass in a window, had seated themselves hardily on the entablature, and from that point despatched their gaze and their railleries both within and without, upon the throng in the hall, and the throng upon the Place.