from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To make or become tough. See Synonyms at harden.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To make tough.
  • v. To become tough.

from the GNU version of the Collaborative International Dictionary of English

  • v. To grow or make tough, or tougher.

from The Century Dictionary and Cyclopedia

  • Specifically, of copper, in its metallurgy, the elimination of the foreign metals as oxids and of copper oxid itself, changing the qualities of the cast from brittleness to ductility.
  • To grow tough or tougher.
  • To make tough or tougher.

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

  • v. make tough or tougher


Sorry, no etymologies found.


  • You gotta fuckin toughen up with the cold and fuckin dealin with rugged not you average fuck around kinda guy.

    Fishing In Alaska

  • Eventually, the skin will "toughen," and your child won't feel as much discomfort.

    Pediatric surgery: Central Line/Subcutaneous Port

  • It's really cute--but you could "toughen" it's image up to make it more "Terp" appropriate.

    Oh Boy, Get Out the Credit Card...New Cupcake Books Galore!!

  • : He thought he was about to be put into one of those vile Boys Bands that the Tedrels used to " toughen" the boys.

    Exile's Valor

  • Well – you must "toughen" your plants more gently than that.

    Gardening by Myself

  • The president, who huddled with cabinet members in the secure Situation Room on Monday "to decide on next steps," also requested that legislation be sent to Congress to "toughen" and reform existing law on caps on damages linked to oil spills, the White House said.

    Turkish Press

  • Oh and don't do anything silly like "toughen" your feet.

    Army Rumour Service

  • Rice, speaking on the ABC's "This Week" program, said the U.S. would press to "toughen" and add to sanctions against North Korea for going forward with the launch.


  • If you lived in literary London and had as many bad reviews as I did, you kind of toughen up anyway.

    The Guardian World News

  • Mr Woolas told the Sunday Times he felt immigration was the second biggest problem facing the population and he would "toughen" up current legislation on the issue.

    British Blogs


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