English edit

Etymology edit

under- +‎ plan

Verb edit

underplan (third-person singular simple present underplans, present participle underplanning, simple past and past participle underplanned)

  1. To plan insufficiently.
    Antonym: overplan
    • 1983, Mack Hanan, Leading edge growth strategies: new approaches for accelerated business growth and premium profits in the next twenty years:
      A manager who underplans and then overachieves his plan has outrun it and is left with no plan at all.