Move in a disorderly group into, crowd into, as in The team piled into the bus. The related expression pile in takes no object, as in Jack opened the car door and yelled, “Pile in!” [First half of 1800s]
Words nearby pile into
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.