Definitions for "Strengthen"
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.
To grow strong or stronger.
make strong or stronger; "This exercise will strengthen your upper body"; "strenghten the relations between the two countries"
Keywords:  elasticity, healthy, tone, let, muscles
give a healthy elasticity to; "Let's tone our muscles"
To animate; to encourage; to fix in resolution.
Keywords:  gain, his, body
gain strength; "His body strengthened"