strengthen
1. [ verb ] make strong or stronger
Synonyms: fortify beef_up
Examples:

"This exercise will strengthen your upper body" "strengthen the relations between the two countries"

Related terms: weaken change reinforce brace confirm buttress undergird substantiate restrengthen batten batten vitalize ruggedise strengthener fortification
2. [ verb ] gain strength
Examples:

"His body strengthened"

Related terms: weaken change consolidate back sandbag proof toughen strengthening
3. [ verb ] give a healthy elasticity to
Synonyms: tone_up tone
Examples:

"Let's tone our muscles"

Related terms: exercise tonicity
Similar spelling:   strengthener
  strengthened
  strength
  strengthening
  stringency
  string_tie
  staring
  storing
  strange
  stringently
  strangeness
  steering
  stirring
  Storment
  strangle
  starring
  styrene
  strewing
  sternwheeler
  Sternotherus
  string_cheese
  stringent
  Stringham
  stronghold
  stirringly
  strongman
  sternutative
  sternutation
  sternpost
  Sterninae
  Sternberg
  Sturnidae
  strenuous
  streaming