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Searching for synonyms for strengthen? Here’s some similar words from our thesaurus you can use instead.
strengthen as in make strong or stronger
  • "This exercise will strengthen your upper body"
  • "strengthen the relations between the two countries"


  • beef up make strong or stronger
  • fortify make strong or stronger; enclose by or as if by a fortification ; prepare oneself for a military confrontation; add nutrients to; add alcohol to (beverages)
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strengthen as in gain strength
  • "His body strengthened"
strengthen as in give a healthy elasticity to
  • "Let's tone our muscles"


  • tone utter monotonously and repetitively and rhythmically; vary the pitch of one's speech ; change the color or tone of; change to a color image; give a healthy elasticity to; the quality of a person's voice; (linguistics) a pitch or change in pitch of the voice that serves to distinguish words in tonal languages; (music) the distinctive property of a complex sound (a voice or noise or musical sound); the general atmosphere of a place or situation and the effect that it has on people; a quality of a given color that differs slightly from another color; a notation representing the pitch and duration of a musical sound; a steady sound without overtones; the elastic tension of living muscles, arteries, etc. that facilitate response to stimuli; a musical interval of two semitones ; the quality of something (an act or a piece of writing) that reveals the attitudes and presuppositions of the author
  • tone up give a healthy elasticity to

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