v. ground·ed, ground·ing, grounds
v. tr.
  1. To place on or cause to touch the ground.
  2. To provide a basis for (a theory, for example); justify.
  3. To supply with basic information; instruct in fundamentals.
    1. To prevent (an aircraft or a pilot) from flying.
    2. Informal. To restrict (someone) especially to a certain place as a punishment.

    3. Source: The American Heritage® Dictionary of the English Language, Fourth Edition
      Copyright © 2000 by Houghton Mifflin Company.
      Published by Houghton Mifflin Company. All rights reserved.

      Entry: confined
      Function: adjective
      Definition: limited
      Synonyms: bedfast, bedridden, bottled up, bound, chilled, circumscribed, compassed, cooped up, cramp, cramped, detained, enclosed, flattened out, GROUNDED, hampered, held, hog-tied, iced, immured, imprisoned, in chains, in jail, incarcerated, incommodious, indisposed, invalided, jailed, laid up, locked up, on ice, restrained, restricted, sealed up, shut in, sick
      Antonyms: free, liberated, unlimited
      Concept: prevention/restriction
      Source: Roget's Interactive Thesaurus, First Edition (v 1.0.0) Copyright 2003 by Lexico Publishing Group, LLC. All rights reserved.