Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • intransitive verb To make strong or increase the strength of.
  • intransitive verb To become strong or stronger.

from The Century Dictionary.

  • To make strong or stronger; add strength to, either physical, legal, or moral; confirm; establish: as, to strengthen a limb; to strengthen an obligation; to strengthen a claim; to strengthen authority.
  • Synonyms To invigorate, fortify, brace, nerve, steel, corroborate, support, heighten.
  • To grow strong or stronger.

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

  • intransitive verb To grow strong or stronger.
  • transitive verb To make strong or stronger; to add strength to.
  • transitive verb To animate; to encourage; to fix in resolution.

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

  • verb transitive To make strong or stronger; to add strength to; to increase the strength of; to fortify; to reinforce.
  • verb transitive To animate; to give moral strength to; to encourage; to fix in resolution; to hearten.
  • verb transitive To augment; to improve; to intensify.
  • verb intransitive To grow strong or stronger.

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

  • verb gain strength
  • verb give a healthy elasticity to
  • verb make strong or stronger

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

strength +‎ -en

Examples

Comments

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