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1. To assemble into a particular formation or arrangement. The troops formed up into straight lines.
2. To organize a group of people or things in a particular manner. In this usage, a noun or pronoun can be used between "form" and "up." Form those clothes up into neat piles, will you?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
1. To come together into an organized shape or formation: At the sergeant's command, the troops formed up into a single line. Our plans formed up quickly after we reviewed the possibilities.
2. To cause something to be created by arranging or organizing: We formed up several teams of players. The marines formed the captives up into two columns and marched them forward.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.