1. Make strong or stronger
   "This exercise will strengthen your upper body"; "strengthen the relations between the two countries"
   - beef up, fortify 
2. Gain strength
   "His body strengthened" 
3. Give a healthy elasticity to
   - tone, tone up

Derived forms: strengthened, strengthening, strengthens

See also: strengthener, strengthening

Type of: alter, change, exercise, modify, work out

Antonym: weaken

• Phalaenopsis amabilis
• Phalaenoptilus
• Phalaenoptilus nuttallii
• phalangeal
• phalanger
• Phalangeridae
• Phalangida
• Phalangiidae
• phalangist
• phalangitis
• Phalangium
• Phalangium opilio
• phalanstery
• phalanx
• Phalaris
• Phalaris aquatica
• Phalaris arundinacea
• Phalaris canariensis
• Phalaris tuberosa
• phalarope
• Phalaropidae
• Phalaropus
• Phalaropus fulicarius
• Phalguna
• Phallaceae