strengthen > define

verb

• Make strong or stronger.
  • usage: "This exercise will strengthen your upper body"; "strengthen the relations between the two countries"
  • synonyms: beef up, fortify
• Gain strength.
  • usage: "His body strengthened"
• Give a healthy elasticity to.
  • usage: "Let's tone our muscles"
  • synonyms: tone, tone up

• (v.t.) To animate; to encourage; to fix in resolution.
• (v.t.) To make strong or stronger; to add strength to; as, to strengthen a limb, a bridge, an army; to strengthen an obligation; to strengthen authority.
• (v.i.) To grow strong or stronger.