Definitions

from The Century Dictionary.

  • noun One who roots for the success of his patron or his side; specifically, in base-ball and other outdoor contests, one who gives aid and encouragement to his side by applause and by shouting advice.
  • noun A plant (or, figuratively, some other thing, or a person) which takes root.
  • noun One who or that which roots or roots up, or tears up by the roots; one who eradicates or destroys.

from the GNU version of the Collaborative International Dictionary of English.

  • noun One who, or that which, roots; one that tears up by the roots.
  • noun Slang, U. S. One who roots, or applauds.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun One who, or that which, roots; one that tears up by the roots.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun an enthusiastic devotee of sports

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

to root + -er

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