regroup

[ree-groop]
verb (used with object)
1.
to form into a new or restructured group or grouping.
verb (used without object)
2.
to become reorganized in order to make a fresh start: If the plan doesn't work, we'll have to regroup and try something else.
3.
Military. to become organized in a new tactical formation.

Origin:
1880–85; re- + group

regroupment, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
regroup (riːˈɡruːp)
 
vb
1.  to reorganize (military forces), esp after an attack or a defeat
2.  (tr) to rearrange into a new grouping or groupings
3.  (intr) to consider using different tactics after a setback in a contest or argument

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

regroup
1885, from re- "again" + group (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
As the day comes to a close, it is a time for families to regroup and enjoy
  their time together.
Sort objects by one or more attributes and regroup the objects based on a new
  attribute.
Model, with student input, how to regroup the blocks.
The beginning of a new semester can be a time to regroup and figure out what
  works given a changing schedule.
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